We have all heard the phrase “you are what you eat.” While simple, this idea reflects an important truth about nutrition and health. Good nutrition means eating the right foods, in the right amounts, to obtain sufficient—but not excessive—essential nutrients. When dietary intake is balanced, the body is better able to remain free from disease, grow and develop properly, function efficiently, and feel its best.

The phrase “you are what you eat” also highlights the cumulative effects of food choices over time. Many nutrients obtained from food quite literally become part of the body. For example, the protein and calcium found in milk can be used to build and maintain bone tissue. Other nutrients influence metabolism, immune function, and energy levels, shaping how we feel on a daily basis and our long-term health.

The foods we choose affect not only how we feel today, but also our risk for chronic diseases such as heart disease and type 2 diabetes, our ability to maintain a healthy body weight, and our overall quality of life. In the sections that follow, we will explore the key components of a healthy diet and how wise food choices support health throughout life.

Components of a Healthy Diet

Achieving a healthy diet is a matter of balancing the quality and quantity of food that you eat to provide an appropriate combination of energy and nutrients. The four key characteristics that make up a healthful diet are discussed below and include 1) adequacy, 2) balance, 3) moderation, and 4) variety.^[1]

1. Adequacy

A diet is adequate when it provides sufficient amounts of calories and each essential nutrient, as well as fiber. Most Americans report not getting enough fruit, vegetables, whole grains, or dairy, which may mean falling short of the essential vitamins and minerals found in these food groups, such as Vitamin C, potassium, and calcium, as well as fiber.

2. Balance

A balanced diet means eating a combination of foods from the different food groups, and because these food groups provide different nutrients, a balanced diet is likely to be adequate in nutrients. For example, vegetables are an important source of potassium, dietary fiber, folate, vitamin A, and vitamin C, whereas grains provide B vitamins (thiamin, riboflavin, niacin, and folate) and minerals (iron, magnesium, and selenium). No one food is more important than the other. It is the combination of all the different food groups (fruits, vegetables, grains, dairy, protein, and fats/oils) that ensures an adequate diet.

3. Moderation

Moderation means not eating to extremes, neither too much nor too little of any one food or nutrient. Moderation means that small portions of higher-calorie, lower-nutrient foods, such as chips and candy, can fit within a healthy diet. Including these types of foods can make healthy eating more enjoyable and also more sustainable. When eating becomes too extreme—where many foods are forbidden—this eating pattern is often short-lived until forbidden foods are overeaten. Too many food rules can lead to a cycle of restriction-deprivation-overeating-guilt. For sustainable, long-term health benefits, it is important to give yourself permission to eat all foods.

4. Variety

Variety refers to consuming different foods within each food group on a regular basis. Eating a varied diet helps to ensure that you consume adequate amounts of all essential nutrients required for health. One major drawback of a monotonous diet is the risk of consuming excessive amounts of certain nutrients and insufficient amounts of others. Trying new foods can also be a source of pleasure—you never know what foods you might like until you try them.

Dietary Guidelines for Americans

The Dietary Guidelines for Americans were first released in 1980.   Ten years later, Congress passed the National Nutrition Monitoring and Related Research Act, which requires that the Dietary Guidelines be jointly updated by (USDA) and (HHS) every five years.

The most current are the  Dietary Guidelines for Americans, 2025–2030, released in January 2026. For the first time in 25 years, this new edition is short,  only nine pages long,  and provides dietary advice written directly for consumers.  Previous editions were very long and contained technical information designed for federal nutrition programs and policies. The central message of the new Guidelines is straightforward: eat real food.   Their web address is easy to remember: www.realfood.gov.

The new Guidelines emphasize the importance of healthy eating patterns across the lifespan while placing greater attention on eating protein at each meal, choosing chosing healthy fats, and limiting ultra-processed foods.^[2]

Rather than focusing on individual nutrients in isolation (e.g., fat, sodium, potassium), the new Guidelines stress overall dietary patterns that support health and reduce the risk of chronic disease.  The seven key messages are listed below.

Dietary Guidance in Other Countries

Many other countries also publish food-based dietary guidelines, and these recommendations vary based on cultural food patterns, environmental priorities, and public health goals. For example, U.S. dietary guidelines—co-sponsored by the USDA—tend to emphasize foods that support domestic agriculture, including beef and full-fat dairy products. In contrast, the United Kingdom’s dietary guidelines place greater emphasis on sustainability and chronic disease prevention by recommending two servings of locally sourced fish per week, limiting red meat intake, and encouraging low-fat dairy choices. Together, these differences highlight that dietary recommendations are shaped by national priorities. .^[3]

Sweden’s dietary guidelines, illustrated below, are designed to be clear, simple, and easy for the public to understand.^[4] Their core three-point message encourages people to: 1) eat MORE vegetables and fruits, 2) SWITCH TO whole grains and healthier fats, and eat LESS sodium, sugar, and salt—recommendations that closely align with long-standing guidance in the United States.

Where the two approaches diverge is in their emphasis on animal fats and red meat. Sweden’s guidelines clearly emphasize eating less red meat and choosing low-fat dairy products and healthier fats, whereas recent U.S. guidance has been more permissive of meat consumption and, in some discussions, has encouraged the use of beef tallow instead of seed oils for cooking. A key concern with this approach is the higher intake of saturated fat, a dietary component consistently linked to an increased risk of cardiovascular disease.

Figure 2.18. “Sweden’s one-minute advice” by Food and Agriculture Organization of the United Nations (FAO

USDA Food Guides

The U.S. government and nearly all other countries use some form of food guide to encourage the public to develop healthy dietary habits. And the images have changed over the years.

The Food Guide Pyramid (1992)

For example, the Food Guide  Pyramid was introduced in 1992 as the symbol of healthy eating patterns for all Americans, as shown below.  It was used for the next decade, but was highly criticized.

However, many people found the MyPyramid graphic confusing and difficult to interpret. In response, First Lady Michelle Obama introduced MyPlate in 2011 to replace MyPyramid. The simple, colorful plate image was designed to help individuals easily visualize the types of foods and relative portions recommended at each meal.