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The Impact of an Unhealthy Diet on Our Health

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Published: Nov 8, 2019

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Poor Nutrition

Measure Breastfeeding Practices and Eating Patterns

Support breastfeeding in the hospital and community, offer healthier food options in early care and education facilities and schools, offer healthier food options in the workplace, improve access to healthy foods in states and communities, support lifestyle change programs to reduce obesity and type 2 diabetes risk.

Good nutrition is essential to keeping current and future generations healthy across the lifespan. A healthy diet helps children grow and develop properly and reduces their risk of chronic diseases. Adults who eat a healthy diet live longer and have a lower risk of obesity, heart disease, type 2 diabetes, and certain cancers. Healthy eating can help people with chronic diseases manage these conditions and avoid complications.

However, when healthy options are not available, people may settle for foods that are higher in calories and lower in nutritional value. People in low-income communities and some racial and ethnic groups often lack access to convenient places that offer affordable, healthier foods.

Most people in the United States don’t eat a healthy diet and consume too much sodium, saturated fat, and sugar, increasing their risk of chronic diseases. For example, fewer than 1 in 10 adolescents and adults eat enough fruits or vegetables. In addition, 6 in 10 young people aged 2 to 19 years and 5 in 10 adults consume at least one sugary drink  on any given day.

CDC supports breastfeeding and works to improve access to healthier food and drink choices in settings such as early care and education facilities, schools, worksites, and communities.

In the United States:

3 IN 4 INFANTS

are not exclusively breastfed for 6 months.

9 IN 10 AMERICANS

consume too much sodium.

1 in 6 PREGNANT WOMEN

have iron levels that are too low.

NEARLY $173 BILLION

a year is spent on health care for obesity.

The Harmful Effects of Poor Nutrition

Overweight and obesity.

Eating a healthy diet, along with getting enough physical activity and sleep, can help children grow up healthy and prevent overweight and obesity. In the United States, 20% of young people aged 2 to 19 years and 42% of adults have obesity, which can put them at risk of heart disease, type 2 diabetes, and some cancers.

Heart Disease and Stroke

Two of the leading causes of heart disease and stroke are high blood pressure and high blood cholesterol. Consuming too much sodium can increase blood pressure and the risk for heart disease and stroke . Current guidelines recommend getting less than 2,300 mg a day, but Americans consume more than 3,400 mg a day on average.

Over 70% of the sodium that Americans eat comes from packaged, processed, store-bought, and restaurant foods. Eating foods low in saturated fats and high in fiber and increasing access to low-sodium foods, along with regular physical activity, can help prevent high blood cholesterol and high blood pressure.

Type 2 Diabetes

People who are overweight or have obesity are at increased risk of type 2 diabetes compared to those at a healthybecause, over time, their bodies become less able to use the insulin they make. Of US adults, 96 million—more than 1 in 3—have  prediabetes , and more than 8 in 10 of them don’t know they have it. Although the rate of new cases has decreased in recent years, the number of adults with diagnosed diabetes has nearly doubled in the last 2 decades as the US population has increased, aged, and become more overweight.

An unhealthy diet can increase the risk of some cancers. Consuming unhealthy food and beverages, such as sugar-sweetened beverages and highly processed food, can lead to weight gain, obesity and other chronic conditions that put people at higher risk of at least 13 types of cancer, including endometrial (uterine) cancer, breast cancer in postmenopausal women, and colorectal cancer. The risk of colorectal cancer is also associated with eating red and processed meat.

CDC’s Work to Promote Good Nutrition

CDC’s Division of Nutrition, Physical Activity, and Obesity  uses national and state surveys to track breastfeeding rates  and eating patterns  across the country, including fruit, vegetable, and added sugar consumption. The division also reports data on nutrition policies and practices  for each state. Data from these surveys  are used to understand trends in nutrition and differences between population groups.

CDC partners use this information to help support breastfeeding and encourage healthy eating  where people live, learn, work, and play, especially for populations at highest risk of chronic disease.

Breastfeeding is the best source of nutrition for most infants. It can reduce the risk of some short-term health conditions for infants and long-term health conditions for infants and mothers. Maternity care practices in the first hours and days after birth can influence whether and how long infants are breastfed.

CDC funds programs that help hospitals use maternity care practices that support breastfeeding . These programs have helped increase the percentage of infants born in hospitals that implement recommended practices 1. CDC also works with partners to support programs designed to improve continuity of care and community support for breastfeeding mothers.

Nearly 56 million US children spend time in early care and education (ECE) facilities or public schools. These settings can directly influence what children eat and drink and how active they are—and build a foundation for healthy habits.

CDC is helping our nation’s children grow up healthy and strong by:

• Creating resources to help partners improve obesity prevention programs and use nutrition standards.
• Investing in training and learning networks that help child care providers and state and local child care leaders meet standards and use and share best practices .
• Providing technical assistance, such as training school staff how to buy, prepare, and serve fruits and vegetables or teach children how to grow and prepare fruits and vegetables.

The CDC Healthy Schools  program works with states, school systems, communities, and national partners to promote good nutrition . These efforts include publishing guidelines and tips on how schools and parents can model healthy behaviors and offer healthier school meals, smart snacks , and water access.

CDC also works with national groups to increase the number of salad bars  in schools. As of 2021, the Salad Bars to School program has delivered almost 6,000 salad bars to schools across the nation, giving over 2.9 million children and school staff better access to fruits and vegetables.

Millions of US adults buy foods and drinks while at work. CDC develops and promotes food service guidelines that encourage employers and vendors to increase healthy food options  for employees. CDC-funded programs are working to make healthy foods and drinks (including water) more available in cafeterias, snack shops, and vending machines. CDC also partners with states to help employers comply with the federal lactation accommodation law and provide breastfeeding mothers with places to pump and store breast milk, flexible work hours, and maternity leave benefits.

People living in low-income urban neighborhoods, rural areas, and tribal communities often have little access to affordable, healthy foods such as fruits and vegetables. CDC’s State Physical Activity and Nutrition Program , High Obesity Program , and Racial and Ethnic Approaches to Community Health program fund states and communities to improve food systems in these areas through food hubs, local stores, farmers’ markets, and bodegas.

These programs, which also involve food vendors and distributors, help increase the variety and number of healthier foods and drinks available and help promote and market these items to customers.

CDC’s National Diabetes Prevention Program  (National DPP) is a partnership of public and private organizations working to build a nationwide delivery system for a lifestyle change program proven to prevent or delay type 2 diabetes in adults with prediabetes. Participants in the National DPP lifestyle change program learn to make healthy food choices, be more physically active, and find ways to cope with stress. These changes can cut their risk of developing type 2 diabetes by as much as 58% (71% for those over 60).

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Guest Essay

Diet Culture Is Unhealthy. It’s Also Immoral.

By Kate Manne

Dr. Manne is an associate professor of philosophy at Cornell University.

This past fall, my daughter, at 20 months, became fascinated with her bellybutton. At every chance she got, she began lifting her T-shirt to joyfully point it out. The inference that Mama and Daddy had bellybuttons too was not far behind, and neither were further exploration efforts. But when she lifted my shirt, I could feel myself sucking in my stomach. I felt shame — and ashamed of my shame. And that’s when it hit me: I have to sort my head out, regarding my body, for the sake of my daughter.

My relationship with my body is, to put it mildly, fraught. I have not always, but I have usually, been fat. I have always hated that fact, although I have tried not to. I have been a so-called normal weight, by the standards of the draconian body mass index guidelines, only when I have been starving myself or eating a highly restrictive and often downright odd diet. Over the past year, I have lost nearly 50 pounds, prompted by a vague sense of obligation to shrink myself back down to size. As usual, the weight came off only with efforts so extreme that I hesitate to admit to them: Over the course of a month last winter, I didn’t eat for 17 out of 30 days.

And I am someone who knows better. I recognize all the reasons I shouldn’t do this. I recognize that the relationship between fatness and health is far from straightforward — that many fat people are healthy and many thin people are not, that the correlation between being fat and having certain diseases is complex and generally mediated by other risk factors, including poverty and the social stigma that keeps fat people from getting the health care they deserve .

I have long admired the work of fat activists — Marilyn Wann, Sonya Renee Taylor and Aubrey Gordon among them — and recognize that fat bodies can be not only healthy but also athletic, beautiful, sexy. I believe in the concepts of intuitive eating and health at every size — at least, for other people. I recognize that the vast majority of diets fail to make people any thinner or any healthier in the long term . I recognize that even if you are a fat person who would be healthier if you lost weight, you don’t owe it to anyone to do so; you don’t owe it to anyone to be healthy in general. And I know how much my internalized fatphobia owes to oppressive patriarchal forces — the forces that tell girls and women in particular to be small, meek, slight, slim and quiet.

I recognize all of this in the abstract. In practice, however, I struggle.

I have lately wondered how much my self-directed fatphobia owes to my career as an academic philosopher. More than one author has remarked that there is a dearth of fat, female bodies in academia in general and in philosophy specifically . Philosophy, with its characteristic emphasis on reason, often implicitly conceives of rationality as the jurisdiction of the lean, rich, white men who dominate my discipline.

We praise arguments for being muscular and compact and criticize prose for being flabby, flowery and, implicitly, feminine. When it comes to our metaphysics — our pictures of the world — we pride ourselves on a taste for austerity, or as W.V.O. Quine put it, “desert landscapes.” And what is the fat body in the popular imagination but excess, lavishness, redundancy?

I struggle as a philosopher to reconcile my image of my body with its task in the world of being the emissary of my mind. I think of it, tongue in cheek, as my body-mind problem. Often, I cannot bear the idea of sending out my “soft animal” of a body, in the words of the poet Mary Oliver, to fight for feminist views that are edgy and controversial and to represent a discipline that prides itself on sharpness, clarity and precision. I feel betrayed by my soft borders.

This false binary exists partly in my own head, yes, but also very much in others’: I was recently apprised of a caption on a portrait of David Hume, the 18th-century philosopher, in an introductory philosophy textbook : “The lightness and quickness of his mind was entirely hidden by the lumpishness of his appearance.” Thus have other fat philosophers been warned that our bodies may similarly mask our intellects.

The cognitive psychologist Steven Pinker isn’t a philosopher, but his latest book, “Rationality,” handily demonstrates the worldview that equates thinness with reason. After bemoaning the fact that rationality is no longer considered “phat” (as in “cool”), he chides the irrational doofus who prefers the “small pleasure” of chowing down on lasagna now over the supposedly “large pleasure of a slim body” in perpetuity. They “succumb” to “myopic discounting” of future rewards — an (ableist) term for short-term thinking, illustrated with a fatphobic example.

Such examples proliferate in philosophy too: The standard example of the much-studied phenomenon of akrasia, weakness of the will, is succumbing to a cookie. The natural human appetite for rich and sugary foods is thereby derided as not only contrary to reason but also something to be tamed, shunned, even shamed. The constant deprivation and, sometimes, sheer hunger of someone who sticks to a rigorous diet is envisaged as an unambiguously good thing and as an achievement, even a virtue.

Is it, though? As someone who recently dieted with some success (“success”), it is obvious to me that I’ve set a bad example for my now 2-year-old daughter — one that will only become more problematic over time, as she becomes more and more aware of what I am or am not eating. I have contributed in a small way to a society that lauds certain bodies and derogates others for more or less arbitrary reasons and ones that lead to a great deal of cruelty and suffering. (The most common basis for childhood bullying is a child’s weight .) I have denied myself pleasure and caused myself the gnawing pain and sapping anxiety of hunger.

These are all things we usually think of as straightforward ethical ills. Almost all versions of the family of moral theories known as consequentialism hold that pleasure is morally good and pain and suffering are morally bad. Even if this is not the whole truth of ethics, it is plausibly part of the truth.

And it has the superficially surprising implication that dieting inflicts real moral costs, real moral harms, ones we largely impose on ourselves (albeit under the influence of potent social forces). If the chances of long-term weight loss (and the supposed benefits and pleasures that conveys) are vanishingly small, then why do we keep doing it? I suspect the answer is not only habit and a false sense of obligation but also the lure of aspiration: a dieter’s perpetual sense of getting somewhere, getting smaller and thus becoming more acceptable, more reasonable , as a body.

But while philosophy in its current form may fetishize thinness, it also has within it the power to challenge these ideas and even to reconfigure our moral relationship to them entirely.

We are at a moment during the year when many people will try, and even regard themselves as duty bound, to go on a diet. But if dieting is a practice that causes a great deal of harm — in the form of pain, suffering, anxiety and sheer hunger — and rarely works to deliver the health or happiness it has long advertised, then it is a morally bad practice. It is plausibly not only permissible but obligatory for individuals to divest from it, to condemn it and not to teach it to our children, either explicitly or by example.

Instead, we might strive within ourselves to meet new and better “ liberating duties, ” to borrow a notion from Joseph Raz. In this case, the duty — for those of us fortunate enough to have the resources — is simply, or not so simply, to eat when we are hungry.

Kate Manne is the author of two books, including, most recently, “Entitled: How Male Privilege Hurts Women.”

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Defining a Healthy Diet: Evidence for the Role of Contemporary Dietary Patterns in Health and Disease

Hellas cena.

1 Laboratory of Dietetics and Clinical Nutrition, Department of Public Health, Experimental and Forensic Medicine, University of Pavia, 27100 Pavia, Italy

2 Clinical Nutrition and Dietetics Service, Unit of Internal Medicine and Endocrinology, ICS Maugeri IRCCS, 27100 Pavia, Italy

Philip C. Calder

3 Human Development and Health, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK

4 NIHR Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton SO16 6YD, UK

The definition of what constitutes a healthy diet is continually shifting to reflect the evolving understanding of the roles that different foods, essential nutrients, and other food components play in health and disease. A large and growing body of evidence supports that intake of certain types of nutrients, specific food groups, or overarching dietary patterns positively influences health and promotes the prevention of common non-communicable diseases (NCDs). Greater consumption of health-promoting foods and limited intake of unhealthier options are intrinsic to the eating habits of certain regional diets such as the Mediterranean diet or have been constructed as part of dietary patterns designed to reduce disease risk, such as the Dietary Approaches to Stop Hypertension (DASH) or Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) diets. In comparison with a more traditional Western diet, these healthier alternatives are higher in plant-based foods, including fresh fruits and vegetables, whole grains, legumes, seeds, and nuts and lower in animal-based foods, particularly fatty and processed meats. To better understand the current concept of a “healthy diet,” this review describes the features and supporting clinical and epidemiologic data for diets that have been shown to prevent disease and/or positively influence health. In total, evidence from epidemiological studies and clinical trials indicates that these types of dietary patterns reduce risks of NCDs including cardiovascular disease and cancer.

1. Introduction

Non-communicable diseases (NCDs) such as cardiovascular disease, cancer, chronic respiratory diseases, diabetes, obesity, and cognitive impairment are among the leading causes of death and disability throughout the world, affecting populations in developed as well as developing countries [ 1 ]. Although there are established genetic and environmental contributors to NCD risk, modifiable lifestyle-related factors play a large role at the individual level [ 2 , 3 , 4 ]. Dietary choices, for example, contribute to the risk for developing hypertension, hypercholesterolemia, overweight/obesity, and inflammation, which in turn increase the risk for diseases that are associated with significant morbidity and mortality, including cardiovascular disease, diabetes, and cancer [ 5 ]. Indeed, the marked rise in chronic NCDs has a causal link to global dietary patterns that are becoming increasingly Westernized [ 6 ], being characterized by high levels of fatty and processed meats, saturated fats, refined grains, salt, and sugars but lacking in fresh fruits and vegetables.

In recognition of the importance of the diet as a determinant of disease risk, the World Health Organization (WHO) Global Action Plan for the Prevention and Control of Noncommunicable Diseases includes strategies for addressing unhealthy diet patterns among its initiatives directed at reducing behavioral risk factors; the other components comprise physical inactivity, tobacco use, and harmful alcohol use [ 1 ]. Dietary changes recommended by WHO include balancing energy intake, limiting saturated and trans fats and shifting toward consumption of unsaturated fats, increasing intake of fruits and vegetables, and limiting the intake of sugar and salt. Many of these dietary targets naturally occur in regional diets such as the Mediterranean diet [ 7 ] or are included as part of evidence-based diets designed to reduce disease risk, such as the Dietary Approaches to Stop Hypertension (DASH) [ 8 ] or Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) [ 9 ] diets. To better understand the current concept of a “healthy diet”, this narrative review describes the features and supporting clinical and epidemiologic data for diets that align with the general WHO guidance and have been shown to prevent disease and/or positively influence health.

2. Components of a Healthy Diet and Their Benefits

A healthy diet is one in which macronutrients are consumed in appropriate proportions to support energetic and physiologic needs without excess intake while also providing sufficient micronutrients and hydration to meet the physiologic needs of the body [ 10 ]. Macronutrients (i.e., carbohydrates, proteins, and fats) provide the energy necessary for the cellular processes required for daily functioning [ 11 ]. Micronutrients (i.e., vitamins and minerals) are required in comparatively small amounts for normal growth, development, metabolism, and physiologic functioning [ 12 , 13 ].

Carbohydrates are the primary source of energy in the diet and are found in the greatest abundance in grains, fruits, legumes, and vegetables [ 14 ]. In terms of deriving a health benefit, whole grains are preferred over processed grains, the latter having been stripped of germ and bran during the milling process, resulting in lower amounts of fiber and micronutrients [ 15 ]. Meta-analyses of prospective cohort studies have linked increased whole-grain intake to a reduced risk of coronary heart disease, stroke, cardiovascular disease, and cancer, as well as to the decreased risk of mortality due to any cause, cardiovascular disease, cancer, respiratory disease, diabetes, and infectious disease [ 15 , 16 , 17 ]. Fresh fruits and vegetables supply energy as well as dietary fiber, which promotes the feeling of satiety and has positive effects on gastrointestinal function, cholesterol levels, and glycemic control [ 18 ]. In addition, fresh fruits and vegetables are key sources of phytochemicals (e.g., polyphenols, phytosterols, carotenoids), which are bioactive compounds believed to confer many of the health benefits associated with fruit and vegetable consumption [ 19 ]. The mechanistic effects of these various phytochemicals are unclear but include their antioxidative properties, as well as their role in regulating nuclear transcription factors, fat metabolism, and inflammatory mediators. For example, flavonoids have been shown to increase insulin secretion and reduce insulin resistance, suggesting that these phytochemicals provide some benefits in obesity and diabetes [ 20 ]. Additionally, polyphenols interact with gastrointestinal microbiota in a bi-directional manner by enhancing gut bacteria and being metabolized by these bacteria to form more bioactive compounds [ 20 ]. Fruit and vegetable intake has been shown to inversely correlate with the risk of NCDs, including hypertension [ 21 ], cardiovascular disease [ 22 , 23 ], chronic obstructive pulmonary disease [ 24 ], lung cancer [ 25 ], and metabolic syndrome [ 26 ].

Dietary proteins provide a source of energy as well as amino acids, including those that the human body requires but cannot produce on its own (i.e., essential amino acids). Dietary proteins are derived from both animal (meat, dairy, fish, and eggs) and plant (legumes, soya products, grains, nuts, and seeds) sources, with the former considered a richer source due to the array of amino acids, high digestibility, and greater bioavailability [ 27 ]. However, animal-based sources of protein contain saturated fatty acids, which have been linked to cardiovascular disease, dyslipidemia, and certain cancers. Although the mechanisms are unclear, red meat, and processed meat in particular, have been associated with an increased risk of colorectal cancer [ 28 , 29 ]. Animal-derived proteins also increase the dietary acid load, tipping the body’s acid-base balance toward acidosis [ 30 , 31 ]. The increased metabolic acid load has been linked to insulin resistance, impaired glucose homeostasis, and the development of urinary calcium stones [ 30 , 31 ].

Adequate dietary protein intake is important for maintaining lean body mass throughout the life span. In older adults, protein plays an important role in preventing age-related loss of skeletal muscle mass [ 32 ], preserving bone mass, and reducing fracture risk [ 33 ]. For older individuals not obtaining adequate protein from their diets, supplementation with amino acids can improve strength and functional status [ 34 ].

Fats (or lipids) are the primary structural components of cellular membranes and are also sources of cellular energy [ 35 ]. Dietary fats fall into 4 categories: monounsaturated fats, polyunsaturated fats, saturated fats, and trans fats. The fat content of food is generally an admixture of these different types [ 35 ]. Unsaturated fats are found in a variety of foods, including fish, many plant-derived oils, nuts, and seeds, whereas animal products (and some plant-derived oils) contribute a larger proportion of saturated fats [ 35 , 36 ]. Trans fats found in foods are predominantly the result of processing vegetable oils but are also present in small quantities in animal products (i.e., ruminant trans fats from cows, sheep, and goats) [ 35 , 36 ]. Among the types of dietary fats, unsaturated fats are associated with reduced cardiovascular and mortality risks, whereas trans fats and, to a lesser degree, saturated fats are associated with negative impacts on health, including increased mortality risk [ 36 , 37 ]. Two families of polyunsaturated fatty acids, omega-3 and omega-6, are described as essential fatty acids, because they are required for normal growth and reproduction but are not produced by the body and, therefore, must be obtained from dietary sources [ 10 ]. Omega-3 fatty acids, in particular, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), have been widely studied for their potential health benefits, with evidence suggesting positive effects including cardioprotection, preventing cognitive decline, reducing inflammation, sustaining muscle mass, and improving systemic insulin resistance [ 38 , 39 , 40 ]. Seafood, especially oily fish, provides EPA and DHA, and supplements are widely available for those not meeting recommended intakes with diet alone [ 41 , 42 ]. Nuts and some seeds and plant oils provide alpha-linolenic acid, the major plant omega-3 fatty acid [ 43 ].

Although required in trace amounts compared with macronutrients, micronutrients are necessary for normal growth, metabolism, physiologic functioning, and cellular integrity [ 12 , 13 ]. The shift from whole foods to processed, refined foods has reduced the micronutrient quality of the modern Western diet [ 44 ]. Vitamin and mineral inadequacies have been implicated in cellular aging and late-onset disease, as scarcity drives chronic metabolic disruption. Keeping with these observations, adequate dietary intake of, or supplementation with, micronutrients that have antioxidant properties (e.g., vitamins A, C, and E, copper, zinc, and selenium) has been suggested as a means to reduce the risk for and progression of age-related diseases [ 45 ].

Water is the principal component of the body, constituting the majority of lean body mass and total body weight [ 13 ]. Water not only provides hydration but also carries micronutrients, including trace elements and electrolytes [ 46 , 47 ]. Drinking water may supply as much as 20% of the daily recommended intake of calcium and magnesium [ 47 ]. Our understanding of water requirements and water’s effect on health and disease is limited, although the global increase in intake of high-calorie beverages has refocused attention on the importance of water for maintaining health and preventing disease [ 46 ].

3. Common Health-Promoting Dietary Patterns

Based on our understanding of nutritional requirements and their likely health impacts as described above, healthy dietary patterns can be generally described as those that are rich in health-promoting foods, including plant-based foods, fresh fruits and vegetables, antioxidants, soya, nuts, and sources of omega-3 fatty acids, and low in saturated fats and trans fats, animal-derived proteins, and added/refined sugars [ 48 ]. Patterns such as these are naturally occurring in certain regions of the world and rooted in local/regional tradition and food sources, as is the case for the traditional Mediterranean and Asian diets. Healthy dietary patterns have also been developed based on studies of nutrient intake and subsequent health measures or outcomes (e.g., the DASH [ 8 ] and MIND [ 9 ] diets) that share some common characteristics ( Figure 1 ).

A generalized healthy diet and lifestyle pyramid.

3.1. Mediterranean Diet

The Mediterranean diet is based on components of the traditional dietary patterns of Euro-Mediterranean countries and encompasses not only the types of foods consumed and their relative contributions to daily nutrient intake, but also an approach to eating that is cognizant of how foods are sourced (e.g., sustainability and eco-friendliness), cooked, and eaten, as well as lifestyle considerations such as engaging in regular physical activity, getting adequate rest, and participating in fellowship when preparing and sharing meals [ 7 ]. Within the core framework of the Mediterranean diet, variations based on geography and culture are reflected in the emphasis on the inclusion of traditional and local food products. The primary basis of daily meals in the Mediterranean diet is cereals such as whole-grain bread, pastas, couscous, and other unrefined grains that are rich in fiber and a variety of fruits and vegetables of different colors and textures that are high in micronutrients, fiber, and phytochemicals ( Table 1 ) [ 7 , 9 , 49 , 50 , 51 , 52 ]. Dairy products, preferably low-fat yogurt, cheese, or other fermented dairy products, are recommended daily in moderation as a source of calcium, which is needed for bone and heart health. Olive oil serves as the primary source of dietary lipids and is supplemented with olives, nuts, and seeds. Water (1.5–2.0 L/day or ~8 glasses) is recommended as the main source of hydration, whereas wine and other fermented alcoholic beverages are generally permitted in moderation, to be consumed with meals. Fish, white meat, and eggs are the primary sources of protein; red meat and processed meats are consumed less frequently and in smaller portions. Legumes are also a preferred source of plant-based proteins [ 7 ].

Comparison of nutritional/lifestyle components among different healthy diet options.

a Recommendations shown here are based on a 2000 calorie per day eating plan. b Contribution of total fat and quality of fat from cheese to stay within the recommended daily intake.

The health benefits of the Mediterranean diet were first described in 1975 by Ancel Keys, who observed a reduction in cardiovascular disease risk among populations whose nutritional model was consistent with practices of peoples from the Mediterranean Basin [ 53 ]. Since that time, research has revealed beneficial effects of the Mediterranean diet on a number of NCDs and related health measures, including cardiovascular and cerebrovascular disease [ 54 ], cancer [ 55 ], glycemic control [ 56 ], and cognitive function [ 57 , 58 ]. Although publication of a key intervention study (Prevención con Dieta Mediterránea; PREDIMED) conducted at multiple sites across Spain and evaluating the Mediterranean diet for the primary prevention of cardiovascular disease was retracted due to irregularities in randomization [ 59 ], a subsequent analysis adjusting for these issues reported a consistent positive effect of adhering to a Mediterranean diet supplemented with olive oil or nuts compared with a reduced-fat diet [ 59 ]. Substudies of PREDIMED have also shown that, compared with a low-fat control diet, the Mediterranean diet supplemented with olive oil or nuts is associated with a 30% reduced risk of major cardiovascular risk events [ 59 ] and reductions in systolic blood pressure (SBP) and diastolic blood pressure (DBP) of 5.8–7.3 mmHg and 3.3–3.4 mmHg, respectively [ 60 ]. In addition, cardiovascular factors such as mean internal carotid artery intima-media thickness (−0.084 mm; p < 0.05) and maximum plaque height (−0.091 mm; p < 0.05) are improved with the Mediterranean diet supplemented with nuts [ 61 ]. Greater intake of polyphenols (phytochemicals found in fruits, vegetables, tea, olive oil, and wine) correlated with a 36% reduced risk of hypertension ( p = 0.015) [ 62 ] and improvements in inflammatory biomarkers related to atherosclerosis (i.e., interleukin [IL]-6, tumor necrosis factor-alpha, soluble intercellular adhesion molecule-1, vascular cell adhesion molecule-1, and monocyte chemotactic protein-1; p < 0.05 for each), as well as in high-density lipoprotein cholesterol (HDL-C; p = 0.004) [ 62 , 63 ].

3.2. Dietary Approaches to Stop Hypertension (DASH)

The DASH diet derives its name from the Dietary Approaches to Stop Hypertension study, which evaluated the influence of dietary patterns on blood pressure [ 8 ]. Patients who consumed a diet that was rich in fruits, vegetables, and low-fat dairy and that included a reduced amount of saturated and total fat and cholesterol experienced significantly greater reductions in blood pressure than patients who consumed a control diet that was similar in composition to a typical American diet (difference in SBP/DBP, −5.5/−3.0 mmHg; p < 0.001) or a diet rich in fruits and vegetables with a reduced amount of snacks and sweets (−2.7/−1.9 mmHg; p ≤ 0.002). All 3 diets had a sodium content of 3 g per day. A subsequent study (DASH-Sodium) that explored the DASH diet or a control diet in combination with varying levels of sodium intake (high, intermediate, and low) found that the DASH diet significantly reduced SBP during the high, intermediate, and low sodium intake phases of both diets (high: −5.9 mmHg; p < 0.001; intermediate: −5.0 mmHg; p < 0.001; low: −2.2 mmHg; p < 0.05) [ 64 ]. The DASH diet also significantly reduced DBP versus the control diet during the high (−2.9 mmHg; p < 0.001) and intermediate (−2.5 mmHg; p < 0.01) sodium intake phases but not during the low intake phase (−1.0 mmHg). Although reducing sodium intake also significantly reduced blood pressure in the control diet group ( p < 0.05), the low sodium phase of the DASH diet elicited significant decreases in SBP/DBP of −8.9/−4.5 mmHg ( p < 0.001 for each) compared with high sodium intake phase of the control diet.

Subsequent controlled trials, as a whole, support the results of the DASH and DASH-Sodium studies in terms of blood pressure reduction. Moreover, these studies expanded the positive impacts of the DASH diet to include improvements in other cardiovascular risk factors or comorbidities (e.g., low-density lipoprotein cholesterol [LDL-C], total cholesterol, overweight/obesity, and insulin sensitivity) [ 65 , 66 , 67 , 68 ] and reductions in adverse outcomes such as development of cardiovascular disease, coronary heart disease, stroke, heart failure, metabolic syndrome, and diabetes (including improved pregnancy outcomes in women with gestational diabetes) [ 68 , 69 , 70 , 71 , 72 ]. Meta-analyses of studies using the DASH diet have demonstrated that LDL-C is significantly reduced by −0.1 mmol/L ( p = 0.03) [ 65 , 68 ], total cholesterol by −0.2 mmol/L ( p < 0.001) [ 65 , 68 ], body weight by −1.42 kg ( p < 0.001) [ 66 , 68 ], and fasting insulin by −0.15 μU/mL ( p < 0.001) [ 65 , 66 , 67 , 68 ]. With the DASH diet, the risk of cardiovascular disease is reduced by 20%, stroke by 19%, and heart failure by 29% ( p < 0.001 for each) [ 69 , 71 ]. The overall risk of diabetes is reduced by 18% [ 68 ], and children and adolescents with higher DASH scores (i.e., those whose diets included the highest intakes of fruits, vegetables, nuts, legumes, low-fat dairy, and whole grains) were at 64% lower risk of developing metabolic syndrome than those with the lowest DASH scores ( p = 0.023) [ 71 ]. Furthermore, rates of cesarean section decreased by 47% [ 72 ], incidence of macrosomia (birth weight > 4000 g) decreased from 39% to 4% ( p = 0.002) [ 70 ], and significantly fewer women experienced gestational diabetes that required insulin therapy on the DASH diet (23%) compared with the control diet (73%; p < 0.0001) [ 70 ].

The dietary pattern derived from the DASH study emphasizes the consumption of an array of vegetables (including colorful varieties, legumes, and starchy vegetables), fruits, fat-free or low-fat dairy products, whole grains, and various protein sources (e.g., seafood, lean meats, eggs, legumes, nuts, seeds, and soya) ( Table 1 ) [ 49 ]. Limited consumption of added sugars (< 10% of calories per day), saturated fats (< 10% of calories per day), sodium (< 2300 mg/day), and alcohol (≤ 1 drink per day for women and ≤ 2 drinks per day for men) is suggested. In addition, further reductions in blood pressure may be achievable by further reducing sodium intake, although practical challenges may limit the ability to achieve sodium intake of 1200 mg or less per day [ 49 ].

3.3. Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND)

The MIND diet combines elements of the Mediterranean and DASH diets with the goal of sustaining cognitive health throughout older age [ 9 ]. Both the Mediterranean and DASH diets have been individually linked to positive cognitive outcomes, including the prevention of cognitive decline or impairment and better cognitive performance [ 73 , 74 , 75 ]. Two high-quality cohort studies have reported associations between adherence to the MIND diet and a 53% lower risk for developing Alzheimer’s disease ( p = 0.002 for linear trend) [ 50 ] and slower declines in cognitive functioning, both overall and within specific cognitive domains (e.g., episodic, semantic, and working memory and perceptual speed and organization), such that the highest adherence rates to the MIND diet were associated with cognitive function equivalent to being 7.5 years younger [ 50 , 76 ]. Interestingly, even modest adherence to the MIND diet was associated with a 35% risk reduction for Alzheimer’s disease versus the lowest adherence group ( p = 0.002 for linear trend), whereas high adherence was needed to demonstrate 54% and 39% risk reductions with the Mediterranean and DASH diets, respectively; high adherence to the Mediterranean and DASH diet showed a statistically significant benefit [ 50 ].

The MIND diet focuses on increasing the intake of fresh fruits and vegetables and emphasizes brain-healthy foods such as green leafy vegetables, nuts, berries, beans, whole grains, fish, poultry, olive oil, and wine in moderation ( Table 1 ) [ 9 , 50 ]. Additionally, foods that are thought to be unhealthy for the brain, such as red meats, butter/margarine, cheese, pastries, sweets, and fried or fast food, are limited [ 9 ]. The specificity regarding the types of foods on the healthy and unhealthy lists differentiates MIND from the Mediterranean or DASH diets [ 50 ].

3.4. Nordic Diet

Iterations of a Nordic diet (e.g., the healthy Nordic diet, New Nordic Diet) arose from the desire to translate the Mediterranean, DASH, and other health-promoting diets into a regionally tailored dietary pattern that uses traditional, local Nordic foods and would be attractive to the public, sustainable, and eco-friendly [ 77 , 78 ]. Overarching tenets of the New Nordic Diet are to consume more (1) calories from plant sources and fewer from animal sources, (2) foods from seas and lakes, and (3) foods from the wild countryside [ 78 , 79 ]. A generalized Nordic dietary pattern would include green leafy vegetables, other vegetables, fruits, fish and seafood, potatoes, berries, whole grains (e.g., wheat, rye, oats, barley), nuts, low-fat dairy products, rapeseed, sunflower, and/or soya oils and limited intake of fresh red meat and sugar [ 78 , 80 ]. Specific dietary recommendations based on the NORDIET clinical trial are presented in Table 1 [ 51 ].

The randomized, controlled NORDIET study compared a healthy Nordic diet with a control diet (the participant’s usual Western diet) [ 77 ]. Over 6 weeks, the Nordic diet improved the lipid profile (including a 0.98 mmol/L reduction in total cholesterol [ p < 0.0001] and a 0.83 mmol/L reduction in LDL-C [ p < 0.001]), lowered SBP by 6.6 mmHg ( p = 0.008), and improved insulin sensitivity (homeostatic model assessment-insulin resistance decreased 0.11; p = 0.01) compared with the control diet. Those on the Nordic diet also experienced a 3.0 kg decrease in body weight ( p < 0.001) despite food being available ad libitum.

Results from subsequent studies conducted using Nordic diet variations are consistent with those from studies with the NORDIET study, demonstrating improvements relative to the control diet in blood lipid profile (LDL-C/HDL-C ratio, −0.15; p = 0.046) [ 81 ], inflammation (IL-1 receptor antagonist, −84 ng/L; p < 0.001) [ 81 ], blood pressure (DBP, −4.4 mmHg ( p = 0.001), and mean arterial pressure (−4.2 mmHg; p = 0.006) among patients with metabolic syndrome [ 82 ] and weight loss (−3.22 kg; p < 0.001) [ 83 ] and blood pressure reduction (SBP/DBP, −5.13/−3.24 mmHg; p < 0.05) in individuals with obesity [ 83 ]. Compared with baseline values, one study demonstrated blood pressure reductions of −6.9 mmHg (SBP) and −3.2 mmHg (DBP; p < 0.01) [ 83 , 84 ]. Additionally, a study conducted in children reported an improvement in omega-3 fatty acid status with the Nordic diet that was associated with improvements in school performance ( p < 0.05) [ 85 ]. A systematic review parsing the individual components of the Nordic diet found that evidence supported the protective effects of eating whole grains on type 2 diabetes and cardiovascular disease risk, but that there was insufficient evidence for other foods in the Nordic diet [ 86 ].

3.5. Traditional Asian Diets

Although there is substantial evidence supporting the Mediterranean and other European-based diets, traditional regional dietary patterns from other parts of the world that follow similar principles have less–well-established links to positive health outcomes. A full description of the breadth of regional diets and the associated evidence bases is beyond the scope of this publication, but we consider some Asian-based diets to be particularly relevant to this discussion.

The traditional Korean diet is composed of rice and other whole grains, fermented food, indigenous land and sea vegetables, proteins primarily from legumes and fish as opposed to red meat, medicinal herbs (e.g., garlic, green onions, ginger), and sesame and perilla oils [ 87 ]. Meals typically consist of multiple small-portion dishes are often derived from seasonal food sources and are home-cooked. Unlike the Western diet, the traditional Korean diet does not include many fried foods [ 87 ]. Epidemiologic data suggest a reduced risk of metabolic syndrome (odds ratio [OR]: 0.77; 95% CI: 0.60–0.99), obesity (OR: 0.72; 95% CI: 0.55–0.95), hypertension (OR: 0.74; 95% CI: 0.57–0.98), and hypertriglyceridemia (OR: 0.76; 95% CI: 0.59–0.99) among individuals who follow traditional Korean dietary patterns [ 88 ]. These findings are consistent with a controlled clinical trial that explored the effects of a traditional Korean diet compared with a control diet (“eat as usual”) on cardiovascular risk factors in patients with diabetes and hypertension. In that study, adherence to a traditional Korean diet favorably influenced body composition (body weight, −2.3 kg; body mass index [BMI], −0.83 kg/m 2 ; body fat, −2.2%; p < 0.01), heart rate (−7.1 bpm; p = 0.002), and glycemic control (HbA1c, −0.72%; p = 0.003) [ 89 ].

The traditional Chinese diet features rice or noodles, soups, vegetables, steamed breads or dumplings, fruits and vegetables, soy, seafood, and meat [ 90 , 91 ]. Although higher in carbohydrates and lower in fat compared with a Western diet, the traditional Chinese diet does not appear to promote weight gain in healthy, normal-weight Chinese, suggesting that carbohydrate restriction may not be a universally applicable intervention to combat obesity and cardiometabolic risk [ 92 ]. One 6-week controlled trial demonstrated that 52% of non-Chinese individuals with overweight or obesity who adhered to a traditional Chinese diet had a reduction in BMI while preserving lean body mass compared with 28% of those who followed a Western diet at the 1-year follow-up assessment [ 93 ]. In another trial, BMI decreased by 0.37 kg/m 2 and lean mass by 0.21 kg among subjects who adhered to a traditional Chinese diet for 6 weeks, whereas those who followed a Western diet had 0.26 kg/m 2 and 0.49 kg reductions in BMI and lean body mass, respectively [ 94 ]. Notably, both of these studies restricted caloric intake to 1,200 Kcal for the test and control diet groups.

Similar to the Korean diet, the traditional Japanese diet (known as Washoku) is characterized by small portions of multiple components, primarily including rice, fish (often eaten raw), soups, and pickles [ 95 ]. Fermented soybean paste (dashi) serves as the base of many of the soups that are central to the traditional Japanese diet; other ingredients include seaweed, fruits and vegetables, and mushrooms. The use of chopsticks, alternating between dishes of small portion size throughout a meal, and the base flavor of Japanese food (umami) enhance satiety and help to prevent overeating. Adherence to a traditional Japanese dietary pattern has been associated with favorable effects on blood pressure among apparently healthy Japanese adults [ 96 ]. This is consistent with data from the 2012 Japan National Health and Nutrition Survey demonstrating that adherence to a traditional Japanese diet compared with a Western diet or a meat- and fat-based dietary pattern was associated with a lower prevalence of hypertension in men [ 97 ]. However, in the same study, a traditional Japanese diet was associated with higher DBP in women, as well as higher waist circumference and BMI in men. Further study is needed to elucidate the health impacts of traditional Japanese and other Asian dietary patterns.

4. Additional Factors

While the evidence reviewed here suggests that the described dietary patterns positively influence measures of health and disease risk and outcome because they encourage the intake of foods that individually have beneficial effects and the avoidance of unhealthy options, additional factors combine to create a lifestyle that promotes health. For example, healthy diets include adequate hydration, typically in the form of water or tea/herbal infusions [ 7 , 49 , 51 , 52 ]. In addition to the dietary components, a healthy lifestyle is one that incorporates regular exercise, socialization, and adequate sleep [ 7 , 52 ], and minimizes elements that have a negative effect on health such as tobacco use, excessive alcohol consumption, physical inactivity, large amounts of screen time, and stress.

The importance of non-dietary factors is reflected in their inclusion in modern food pyramids. Built on a base of positive lifestyle factors, the lower tiers indicate daily consumption of adequate hydration and nutrient-rich, plant-based foods, with animal-derived products (meat, fish, and dairy) and sweets comprising higher tiers of the pyramid (i.e., less frequently or infrequently consumed items).

Whereas the goal may be to achieve nutrient requirements through food and water intake alone, there are situations in which food-derived nutrient intake might be inadequate due to increased need, selective eating, or food insecurity/limited access to more nutritious foods [ 98 , 99 , 100 ]. Therefore, for some individuals, dietary supplements may be required, particularly at certain life phases. For example, later in life, the recommended intake of calcium increases to sustain bone mineral density [ 101 ]; hence, supplementation with calcium may be necessary to meet recommended intake levels in older adults. Before initiating supplementation, dietary intake levels should be considered to avoid exceeding the upper tolerability limits and causing adverse events.

There are a number of other traditional regional diets that likely have similar benefits to those that we describe here. However, we made the decision to narrow our focus to those diets with evidence from randomized, controlled trials demonstrating their health benefits. For example, the African Heritage Diet focuses on traditional ingredients that may be beneficial to African American populations who experience disproportionately higher risks for chronic diseases related to their diets [ 102 ]. Future research is warranted to evaluate the impact of the African Heritage Diet and other regional dietary patterns on health.

5. Conclusions

Healthy diets, arising either by tradition or design, share many common features and generally align with the WHO Global Action Plan for the Prevention and Control of Noncommunicable Diseases. In comparison with a Western diet, these healthier alternatives are higher in plant-based foods, including fresh fruits and vegetables, whole grains, legumes, seeds, and nuts and lower in animal-based foods, particularly fatty and processed meats. Evidence from epidemiologic studies and clinical trials indicates that these types of dietary patterns reduce risks of NCDs ranging from cardiovascular disease to cancer. Further endeavors are needed to integrate these healthy dietary and lifestyle choices into daily living in communities throughout the world and to make healthy eating accessible, achievable, and sustainable.

Acknowledgments

Medical writing support was provided by Crystal Murcia, PhD, and Dennis Stancavish, MA, of Peloton Advantage, LLC, an OPEN Health company, and was funded by Pfizer Consumer Healthcare. On 1 August 2019, Pfizer Consumer Healthcare became part of GSK Consumer Healthcare.

Author Contributions

H.C. and P.C.C. contributed to the conception of the work; the acquisition, analysis, and interpretation of data; drafting; and revision of the work. Both have approved the final version for submission and agree to be personally accountable for their contributions and for ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated, resolved, and documented in the literature. All authors have read and agreed to the published version of the manuscript.

Medical writing support was funded by Pfizer Consumer Healthcare; this research received no other external funding. The APC was funded by Pfizer Consumer Healthcare. On 1 August 2019, Pfizer Consumer Healthcare became part of GSK Consumer Healthcare.

Conflicts of Interest

Hellas Cena received travel reimbursement from Pfizer Consumer Healthcare to attend a discussion meeting prior to drafting the manuscript and acts as a consultant to companies that manufacture or market dietary supplements, including Pfizer Consumer Healthcare. Philip C. Calder received travel reimbursement from Pfizer Consumer Healthcare to attend a discussion meeting prior to drafting the manuscript. Pfizer Consumer Healthcare funded this project, but the company had no role in the design, execution, interpretation, or writing of the paper.

What Are the Effects of an Unhealthy Diet?

When you come home after a long day of work, it can be tempting to order some food or grab takeout and relax. After all, who wants to go through all the effort of cooking and cleaning up when you're tired? Consuming fast food occasionally isn't harmful, but eating too much can result in an unhealthy diet. Unhealthy diets can be harmful and have long-term effects on your health.

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An unhealthy diet can lead to health issues such as malnutrition, poor digestion, inflammation, unwanted weight gain and obesity. It can also increase your risk of chronic diseases, such as diabetes and heart disease, and impact your mental health.

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What Is a Healthy Diet?

You've probably heard the saying a million times — "eat a balanced diet." But what exactly is a balanced diet ? According to the Office of Health Promotion and Disease Prevention , the American dietary guidelines state that most people should consume:

• ‌ Grains, including bread, pasta and rice. ‌ Nine to 11 servings per day are recommended.
• ‌ Vegetables. ‌ Four to five servings each day are recommended.
• ‌ Fruit. ‌ Three to four servings each day are recommended.
• ‌ Protein, including beans, fish, meat and nuts. ‌ Two to three servings per day are recommended.

Consumption of all of these constitutes a balanced, healthy diet. Together, these foods give you all of the recommended vitamins and minerals you need each day. This includes vitamins A, C, E and K as well as B-complex vitamins. It also includes quite a few minerals, including calcium, copper, iodine, iron, magnesium, manganese, phosphorus, potassium, selenium and zinc. There is no single food that can give you all of these nutrients.

What Is an Unhealthy Diet?

Now that we know what a balanced diet is, what is an unhealthy diet ? There are actually many types of unhealthy diets. Traditionally, fast food products are linked to unhealthy diets, as one in three Americans eats fast food each day . Rich in carbohydrates and high-fat content, frequent consumption of fast food products like fries, fried chicken and pizza can definitely contribute to an unhealthy diet. However, fast foods aren't the only cause of unhealthy diets.

Unhealthy diets can involve eating only one type of food. Recently, an extreme diet called the carnivore diet received attention from the media because the diet involves eating only meat. A person who is consuming only meat products is likely not getting the daily vitamins and minerals he or she needs. This can be easily rectified by adding fruits, vegetables and grains to the diet. A diet involving one single type of food of any kind is likely going to be bad for you in the long run.

Another example of an unhealthy diet is a diet involving excessive consumption of a certain product or nutrient. An example of this is a diet high in sodium . Someone who chooses to eat bacon, cold cuts and other salt-preserved products with frequency will likely be consuming too much sodium. This can result in a variety of health issues , like increased blood pressure and risk of cardiovascular disease. While a little extra salt here and there may not seem like a big deal, 9 out of 10 Americans eat too much sodium. In general, consuming too much of anything can result in an unhealthy diet with negative health benefits.

The Dangers of Unhealthy Eating

The effects of unhealthy eating can sometimes result in obvious physical changes, such as acne, bloating and weight gain. Certain unhealthy diets, like those linked to too much fast food, can result in obesity and related diseases. According to the Centers for Disease Control , having overweight or obesity can increase the risk for diabetes, heart disease, osteoarthritis, stroke and many other conditions. Obvious physical changes don't occur to everyone. However, just because the effects of unhealthy eating aren't obvious doesn't mean they aren't happening.

It's possible to consume an unhealthy diet for a long time and suddenly experience its effects. According to a Civil Eats interview with Hilal Elver , the United Nations Special Rapporteur on the Right to Food, fast foods are a leading cause of malnutrition. Malnutrition is one of the biggest dangers of unhealthy eating and can lead to diseases like scurvy. Caused by a deficiency in vitamin C , scurvy can happen to people who prefer carbohydrate-rich diets, avoiding fresh fruit and vegetables. An unhealthy diet won't immediately cause scurvy. You'd have to be vitamin C-deficient for about three months before getting this disease.

Nutrient deficiencies can also have long-term effects. According to the book Modern Nutrition in Health and Disease , written by Department of Nutritional Sciences researchers at Pennsylvania State University, certain vitamins and minerals can reduce your chance of diseases that appear later in life, like osteoporosis. Calcium and vitamin D contribute to bone health and can reduce the risk of osteoporosis as you age.

The effects of your eating habits are more important than you may realize. Every food that you eat has the potential to change your gut microbiome. According to a 2014 study in Nature , trillions of microorganisms reside in your digestive system. The microbes that live in these communities are influenced by the foods you eat every day. Unhealthy diets can cause an imbalance in these microbial communities and allow too many of a certain type to live in your gastrointestinal tract. This can negatively impact digestion, metabolism and cause diseases like inflammatory bowel disease. Because your gut is directly linked to your brain through a cranial nerve, your diet can even impact your mental health.

The effects of eating habits may be more influential than you think. It's important to be aware of both the short-term and long-term effects of unhealthy eating, and to always try to consume a balanced diet.

• Harvard Medical School: Listing of Vitamins
• CDC: Fast Food Consumption Among Adults in the United States, 2013–2016
• Popular Science: Please Do Not Try to Survive on an All-Meat Diet
• American Heart Association: 9 out of 10 Americans Eat Too Much Sodium
• American Heart Association: Get the Scoop on Sodium and Salt
• CDC: Disability and Obesity
• Civil Eats: In the Battle Against Malnutrition, UN Expert Says Junk Food is the Real Culprit
• Baylor University Medical Center Proceedings: Scurvy in 2017 in the USA
• American Journal of Medicine: Scurvy, a Not-So-Ancient Disease
• Public Health Nutrition: Diet, Nutrition and the Prevention of Osteoporosis
• Nature: Diet Rapidly and Reproducibly Alters the Human Gut Microbiome
• Frontiers in Neuroscience: The Vagus Nerve at the Interface of the Microbiota-Gut-Brain Axis
• CAB Direct: Modern nutrition in health and disease

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Balanced Diet Essay for Students and Children

500 words essay on balanced diet.

We have grown up listening to the term ‘balanced diet’ in science. It refers to a diet that has all the essential nutrients and minerals that will keep us healthy. Having a balanced diet has been encouraged by our childhood. After all, it is important in keeping our health well.

A person intakes appropriate amounts of proteins, minerals, and nutrients in a balanced diet. It is quite necessary for the smooth functioning of our body. If we consume a balanced diet regularly, we will always remain healthy. It lessens any chances of falling ill. Moreover, a balanced diet also boosts our immunity system.

Importance of a Balanced Diet

Most people believe that a balanced diet is definitely the key to a healthy lifestyle. It is rightly believed as even scientists say so. When we always consume a balanced diet, we will maintain our physical as well as mental health. A balanced diet must contain the proper foods that are consumed in apt quantities. A perfect balanced diet is composed of carbohydrates, proteins, fats, minerals, high fiber content, vitamins, and more.

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Moreover, nowadays the trend of junk food is here to stay. People are not taking a balanced diet rather eating all sorts of harmful foods. It is more important than ever to tell people about the importance of a balanced diet. You cannot merely exercise and expect your body to stay fit. A balanced diet is crucial for that.

Most importantly, it is called a ‘balanced’ diet because it requires all the foods to be eaten in a balanced manner. For instance, if you intake large amounts of carbohydrates and a little amount of protein, then that will not be called a balanced diet, even if you are eating the right foods. The balance needs to be maintained for that.

How to Have a Balanced Diet?

One can always adopt a healthy lifestyle by starting to consume a balanced diet. Firstly, one must definitely increase the amount of liquid to consume in a day. Fluids are very important for the human body to function healthily. As almost 80% of our body is filled with water, we need it for good metabolism. Thus, start with drinking at least two to three liters of water every day. Moreover, try cutting down on the consumption of tea, coffee, alcohol, and other such addictive liquids.

Furthermore, one must always eat fresh vegetables and fruits. As fresh fruits and vegetables are great sources of fiber and vitamins, we must consume them for good body growth. Try to avoid eating deep-fried or overcooked food as it loses all its nutrients. The balanced diet must have the five essential elements, i.e. bitter, sour, sweet, pungent and salty. Also, the emphasis is on fresh fruits because the processed or packed ones do not have nutrients.

Most importantly, always chew your food patiently. Do not just swallow it after chewing for four-five times. This way your food won’t get digested properly. Savor the food slowly and steadily. Next, do not eat in excess. You must know when to draw the line and stop when you don’t have the appetite. Therefore, we see how a balanced diet will keep you healthy and fit. It will improve the quality of your life and keep all the illnesses away.

FAQs on Balanced Diet Essay

Q.1 Why is a balanced diet important?

A.1 Balanced diet is important because it keeps us fit and fine. It also prevents any illnesses or diseases.

Q.2 How can we have a balanced diet?

A.2 One can have a balanced diet by having a good amount of water. Furthermore, one must always consume fresh foods and chew slowly for proper digestion.

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Importance of Healthy Diet essay

A healthy diet is one that helps to maintain or improve overall health. We should consume a balanced diet consisting of essential nutrition. A healthy and balanced diet reduces stress levels and promotes healthy life without any suffering.

Importance of Healthy Diet essay (350+ Words)

People consume junk foods and unhealthy items solely for taste, neglecting the importance of nourishing their bodies. A healthy and balanced diet reduces stress and promotes a suffering-free life, highlighting its utmost significance.

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A healthy diet maintains or improves overall health through essential nutrition: liquids, proteins, fatty acids, vitamins, minerals, and calories. To maintain a healthy body, we should consume fresh fruits, salad, green leafy vegetables, milk, eggs, yogurt, etc., on time.

Green vegetables and fruits provide minerals like iron, calcium, sodium, potassium , iodine, copper, etc. Fish oil, butter, carrot, papaya, etc., contain Vitamin A, while green leafy vegetables, wheat grain, etc., contain Vitamin B.

Vitamin C is found in green chili, green vegetables, amla, lemon, and citric fruits. Vitamin D is present in fish oil, butter, and sun rays. Vitamins E and K are necessary for our health, and milk is a well-balanced diet on its own.

We should only eat fresh, well-washed, and well-cooked food that is free from dust and flies. Harmful are fried foods and foods with excess fat, spices, and chilies. Eating on the roadside should be avoided. The last meal should be taken two or three hours before going to bed. Our stomach needs a good time gap between two meals for proper digestion.

In addition to proper nutrition, a healthy body requires daily physical activities, adequate rest and sleep, cleanliness, a healthy environment, fresh air, and water, as well as personal hygiene. Furthermore, it is important to drink a sufficient amount of water, at least 7-8 glasses. This not only balances blood pressure but also supplies essential nutrients rapidly to the body. An individual who is fit and healthy develops a higher resistance to infections and diseases.

While wealth holds some significance, it is not as important as health. Spending a large amount of money on junk food in five-star hotels or other entertainment sources, such as watching films for a day, yields no advantages except for self-satisfaction.

Physical and mental well-being enables an individual to be socially and financially healthy. A healthy person is more active, lively, and energetic, working with utmost efficiency. Conversely, a wealthy but unhealthy person easily succumbs to fatigue, ultimately losing the true wealth of life, namely, health.

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Healthy Diet Essay

Consuming a healthy diet throughout a person’s life helps prevent malnutrition in all its forms, as well as a range of diet-related non-communicable diseases and conditions. But the increased consumption of processed food, rapid urbanisation and changing lifestyles have led to a shift in dietary patterns. People now consume fast food and do not eat enough fibre-rich fruits, vegetables and whole grains. So, to help students understand the importance of a healthy diet, we have provided a “Healthy Diet” essay.

Students can also go through the list of CBSE Essays on different topics. It will help them to improve their writing skills and also increase their scores on the English exam. Moreover, they can participate in different essay writing competitions which are conducted at the school level.

500+ Words Healthy Diet Essay

A healthy diet consists of simple, natural and/or well-cooked foods which promote health and protect us from diseases. It keeps our organ systems functioning well. The diet that we consume is decided by our socio-cultural norms, lifestyle patterns and the type of activities we are engaged in. A healthy diet includes nutrition, nutrients, food groups, a balanced diet and special dietary requirements.

Balanced Diet

A diet that contains all the essential nutrients like proteins, carbohydrates, fats, minerals and vitamins in the proportion required for the normal growth and development of the body is called a balanced diet. The important components of a balanced diet are cereals, pulses, milk, fruits and vegetables, fats and oil. A balanced diet constitutes a healthy diet. Thus, we all should try to follow a balanced diet.

Role of Nutrients

Nutrients that we obtain through food have vital effects on physical growth and development. It also helps in maintaining normal body function, physical activity and health. Nutritious food is thus needed to sustain life and activity. A healthy diet must provide all essential nutrients in the required amounts. Requirements for essential nutrients vary with age, gender, physiological status and physical activity. Dietary intakes lower or higher than the body requirements can lead to undernutrition or overnutrition, respectively.

Eating too little food during certain significant periods of life such as infancy, childhood, adolescence, pregnancy and lactation and eating too much at any age can lead to harmful consequences. An adequate diet, providing all nutrients, is needed throughout our lives. Eating a variety of foods from each food group is crucial for supplying the individual with all the essential nutrients that the body needs, including carbohydrates, proteins, fats, vitamins, minerals and water.

Special Dietary Requirements

The amount of food or nutrients required by a person in a day depends upon the need for energy. These needs are directly related to age and physical activity. During the rapid growth years, i.e. 12–22 years for boys and 12–18 years for girls, there is a gradual increase in daily food requirements. But as we grow old, our daily need for energy decreases. The amount of energy required by people engaged in low, moderate or high levels of physical activity differs. A sports person always needs to consume more calories than a non-sports person. Similarly, the dietary needs of a woman during pregnancy and lactation are higher.

Before we eat, we should think about what goes on our plate, cup, or bowl. Foods like vegetables, fruits, whole grains, low-fat dairy products, and lean protein foods should be part of our diet. These contain the nutrients that we need to maintain a heart-healthy eating plan. Eating a healthy diet will keep our body fit, healthy and free from all kinds of diseases. With a healthy body and mind, we can enjoy our life and can achieve whatever we want in our life.

Students must have found the “Healthy Diet” essay useful for improving their essay writing skills. They can get the study material and the latest updates on CBSE/ICSE/State Board/Competitive Exams at BYJU’S.

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