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In nutrition, diet is the sum of food consumed by a person or other organism. The word diet often implies the use of specific intake of nutrition for health or weight-management reasons (with the two often being related). Although humans are omnivores, each culture and each person holds some food preferences or some food taboos. This may be due to personal tastes or ethical reasons. Individual dietary choices may be more or less healthy.
Complete nutrition requires ingestion and absorption of vitamins, minerals, essential amino acids from protein and essential fatty acids from fat-containing food, also food energy in the form of carbohydrate, protein, and fat. Dietary habits and choices play a significant role in the quality of life, health and longevity.
Health agencies recommend that people maintain a normal weight by limiting consumption of energy-dense foods and sugary drinks, eating plant-based food, limiting consumption of red and processed meat, and limiting alcohol intake.
The Dietary Guidelines for Americans is an evidence-based information source that policy makers and health professionals use to advise the general public about healthy nutrition.
Many people choose to forgo food from animal sources to varying degrees (e.g. flexitarianism, pescetarianism, vegetarianism, veganism) for health reasons, issues surrounding morality, or to reduce their personal impact on the environment, although some of the public assumptions about which diets have lower impacts are known to be incorrect. Raw foodism is another contemporary trend. People who follow these diets can get all necessary nutrients, but may need to specifically focus on consumption of nutrients like protein (nutrient), iron, calcium, zinc, and B12. 
A particular diet may be chosen to promote weight loss or weight gain. Changing a subject's dietary intake, or "going on a diet", can change the energy balance and increase or decrease the amount of fat stored by the body. The terms "healthy diet" and "diet for weight management" are often related, as the two promote healthy weight management. If a person is overweight or obese, changing to a diet and lifestyle that allows them to burn more calories than they consume may improve their overall health, possibly preventing diseases that are attributed in part to weight, including heart disease and diabetes. Conversely, if a person is underweight due to illness or malnutrition, they may change their diet to promote weight gain. Intentional changes in weight, though often beneficial, can be potentially harmful to the body if they occur too rapidly. Unintentional rapid weight change can be caused by the body's reaction to some medications, or may be a sign of major medical problems including thyroid issues and cancer among other diseases.
An eating disorder is a mental disorder that interferes with normal food consumption. It is defined by abnormal eating habits and thoughts about food that may involve eating much more or much less than needed. Common eating disorders include anorexia nervosa, bulimia nervosa, and binge-eating disorder. Eating disorders affect people of every gender, age, socioeconomic status, and body size.
Religious and cultural dietary choices
Some cultures and religions have restrictions concerning what foods are acceptable in their diet. For example, only Kosher foods are permitted by Judaism, and Halal foods by Islam. Although Buddhists are generally vegetarians, the practice varies and meat-eating may be permitted depending on the sects. In Hinduism, vegetarianism is the ideal. Jains are strictly vegetarian and consumption of roots is not permitted.
Diet classification table
|Crustaceans & mollusks||Yes||Yes||Yes||Sometimes||No||No||No||Yes||Yes||No||Maybe[h]||Maybe||No|
- Some plants traditionally considered to be vegetables—such as tomatoes, eggplants, capsicums, and zucchinis—are permitted.
- Typically, potatoes are not permitted but cassava, yams, and sweet potatoes are.
- Almost all permit either egg or dairy consumption, with most allowing both. Stricter rules, like seagans, also reject eggs and dairy along with their rejection of poultry and red meat.
- Lacto vegetarians, ovo-lacto vegetarians, and Jain Vegetarians permit dairy.
- Dairy is permitted but is not to be cooked or consumed with any meats or fish
- Both ovo vegetarians and ovo-lacto vegetarians permit eggs.
- Locusts are sometimes permitted, depending on the religious denomination.
- Mollusks and crustaceans like crab are prohibited according to the Shi'a branch of Islam. The acceptability of shrimp/prawn is debated
- noun, def 1 – askoxford.com
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- Keown, Damien (26 August 2004). A Dictionary of Buddhism. Oxford University Press. p. 77. ISBN 9780191579172.
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- The dictionary definition of diet at Wiktionary