diet (nutrition)
 This article is primarily about the human diet. For a discussion of animal diets, see List of feeding behaviours.
In nutrition, the diet is the sum of food consumed by a person or other organism.[ noun, def 1 askoxford.com] Dietary habits are the habitual decisions an individual or culture makes when choosing what foods to eat. Although humans are omnivores, each culture holds some food preferences and some food taboos. Individual dietary choices may be more or less healthy. Proper nutrition requires the proper ingestion and equally important, the absorption of vitamins, minerals, and fuel in the form of carbohydrates, proteins, and fats. Dietary habits and choices play a significant role in health and mortality, and can also define cultures and play a role in religion.
Traditional diet
"Traditional diet" is the diet of native populations such as the Native Americans, Khoisan or Australian Aborigines.
Traditional diets vary with availability of local resources, such as fish in coastal towns or grains in farming towns, as well as with cultural and religious customs and taboos. In some cases, the crops and domestic animals that characterize a traditional diet have been replaced by modern high-yield crops, and are no longer available.[An article about traditional diet] The slow food movement attempts to counter this trend and to preserve traditional diets.
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.
Diet and life outcome
A study published in the British medical journal The Lancet demonstrated that those who had been well-fed soon after they were born earned almost 50% more in average salary than those who had not. The study was performed by giving a high-nutrition supplement to some infants and a lower-nutrition supplement to others, with only the researchers knowing which infants received which supplements (see double-blind study.) The infants that received the high-nutrition supplement had higher average salaries, proving that infant nutrition affects cognitive development independent of other factors such as class or parental income.
Individual dietary choices
Many individuals choose to limit what foods they eat for reasons of health, morality, environmental impact, or other factors. Additionally, many people choose to forgo food from animal sources to varying degrees; see vegetarianism, veganism, fruitarianism, living foods diet, and raw foodism.
Properly planned vegetarian and vegan diets have been found to completely satisfy nutritional needs in every stage of life,[online copy available]and significantly reduce risks of major diseases.
Diets for weight management
A particular diet may be chosen to seek weight gain, weight loss, sports training, cardio-vascular health, avoidance of cancers, food allergies and for other reasons. 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. Some foods are specifically recommended, or even altered, for conformity to the requirements of a particular diet. These diets are often recommended in conjunction with exercise.
Eating disorders
An eating disorder is a mental disorder that interferes with normal food consumption. Eating disorders often affect people with a negative body image.
Evolution of the human diet
The evolution of the human diet encompasses the nutritional history of modern humans and their close reletives (Homo genus), dating back to roughly 2.5 million years ago.
See also
Healthy diet
List of diets
Sustainable diet
Notes
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