Diet (nutrition)
Sum of food consumed; key to health, weight, and culture.
In nutrition, a diet refers to everything a person or other living being eats. The term frequently describes a planned way of eating aimed at improving health or managing weight, two goals that often overlap. Humans are naturally omnivorous, but personal tastes, ethical beliefs, and cultural norms shape what each individual or group chooses to eat—or avoid. Some dietary patterns are healthier than others. To be fully nourished, the body needs vitamins, minerals, essential amino acids from protein, essential fatty acids from fats, and energy from carbohydrates, proteins, and fats. What people eat and how they eat it strongly influences their quality of life, overall health, and how long they live.
A well-chosen diet supports both mental and physical health. Certain eating plans, like the DASH diet, are used to help manage chronic diseases. Many countries offer dietary guidelines, which typically promote a balanced diet suited to local culture. These guidelines differ from dietary reference values, which focus on preventing nutrient shortages. As of 2025, only about 30.8% of children aged 6 to 23 months and 62.7% of women aged 15 to 49 eat a minimally diverse diet.
Some people follow exclusionary diets, avoiding certain foods or food groups for health reasons, personal choice, or ethical concerns. For example, many reduce or eliminate animal products to varying degrees—such as flexitarianism, pescetarianism, vegetarianism, or veganism—for health, moral, or environmental reasons. A well-planned vegetarian or vegan diet can provide adequate nutrition, but may require extra attention to nutrients like protein, iron, calcium, zinc, and vitamin B12. Other approaches include raw foodism and intuitive eating. Factors like education, income, local food availability, and mental health heavily influence what people eat.
People may also choose a diet to lose or gain weight. Changing what you eat alters the body’s energy balance, affecting how much fat is stored. “Healthy diet” and “diet for weight management” are closely linked because both promote maintaining a healthy weight. For someone overweight or obese, shifting to a diet and lifestyle that burns more calories than consumed can improve health and help prevent conditions like heart disease and diabetes. Obesity rates have risen nearly 10% in the past decade. On the other hand, someone underweight due to illness
- Field
- Nutrition
- Key Concepts
- Healthy diet, weight management, dietary choices, meat consumption, environmental impact
- Related Terms
- DASH diet, exclusionary diets, vegetarianism, veganism, raw foodism, intuitive eating
- Health Impact
- Improves mental and physical health; used in treatment of chronic conditions
- Global Data (2025)
- 30.8% of children aged 6–23 months and 62.7% of women aged 15–49 consume a minimally diverse diet
- Meat & Cancer
- Processed meat causes cancer (IARC); red meat is a probable cause
Lore & Background
Complete nutrition requires ingestion and absorption of vitamins, minerals, essential amino acids, essential fatty acids, and food energy from carbohydrate, protein, and fat. Dietary recommendations exist for many countries, usually emphasizing a balanced diet that is culturally appropriate. These recommendations differ from dietary reference values, which focus on preventing nutrient deficiencies. Exclusionary diets avoid certain foods for health, moral, or environmental reasons; balanced vegetarian or vegan diets can provide adequate nutrition but may require attention to specific nutrients like protein, iron, calcium, zinc, and vitamin B12.
Reader's Guide
Diet is central to human health and longevity. A healthy diet can improve mental and physical health, and specific diets like the DASH diet are used to manage chronic conditions. Dietary choices are influenced by education, income, local availability, and mental health. Weight management through diet can prevent diseases such as heart disease and diabetes, though rapid weight change can be harmful. Meat consumption, particularly processed meat, is linked to cancer and cardiovascular disease. Environmental concerns drive sustainable dietary choices, such as reducing meat and dairy. Religious and cultural restrictions, like Kosher, Halal, and vegetarianism in various faiths, also shape diets. The Mediterranean diet and vegetarianism are common among Christians and are associated with balanced nutrition.
Did You Know?
- In 2025, only 30.8% of children aged 6–23 months consumed a minimally diverse diet.
- The International Agency for Research on Cancer states processed meat causes colorectal cancer.
- Balanced vegetarian or vegan diets can provide adequate nutrition but may need focus on protein, iron, calcium, zinc, and vitamin B12.
- The food system accounts for about one-quarter of greenhouse gas emissions.
Frequently Asked Questions
What exactly is a diet in the context of nutrition?
A diet encompasses every food and drink a person or living organism consumes. In common usage, the word also refers to a structured eating plan designed to boost overall health or help manage body weight.
What role does diet play in keeping the body healthy?
A well-balanced diet supplies the vitamins, minerals, essential amino acids, essential fatty acids, and caloric energy the body cannot produce on its own. Proper nutrition supports both mental and physical well-being and is a core component of treating chronic conditions.
Why do people choose different dietary patterns?
Personal taste, ethical convictions, cultural traditions, and environmental concerns all influence what individuals and communities decide to eat or avoid. These choices range from omnivorous eating to vegetarianism, veganism, raw foodism, and intuitive eating.
What is the link between meat consumption and cancer risk?
The IARC classifies processed meat as a known cause of cancer, while red meat is considered a probable carcinogen. This finding is one reason many people limit or eliminate animal products from their plates.
How widespread are inadequate dietary patterns globally?
As of 2025, roughly 30.8% of children between six and twenty-three months and 62.7% of women aged fifteen to forty-nine consume what is classified as a minimally diverse diet. These figures highlight how common nutritional gaps remain even in well-resourced regions.
More in General Health And Wellness 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record