"Nutrition" as a noun, the term has been the practice for the public to use, but it is not necessarily the exact definition of an accurate understanding.
"Camp" where the characters are seeking the meaning of "support" is the health or self-cultivation, combined with the word should be "to seek health" means. Rather, it should be "a food or food ingredient beneficial to seek health", "nutrition" is precise and relatively complete. The whole of the definition should be: "body through the ingestion of food, after in vivo digestion, absorption and metabolism, the use of food substances that are beneficial to the body as a building body tissues and organs, physiological functions and physical activity to meet the needs of the process." The study of human and other organisms nutritional problems of learning is called nutrition.
In the course of human life activity requires constant intake of food from the external environment and gain life activities necessary nutrients, these nutrients in dietetics called "nutrients."
Essential nutrients are carbohydrates, lipids, proteins, minerals, vitamins; a total of five categories, including nutrients can not be synthesized in the body, and must be obtained from food, called "essential nutrients."
These include:-
Nine kinds of amino acids: Isoleucine, leucine, lysine, Methionine, Phenylalanine, Threonine, Tryptophan, Valine, Histidine
Two kinds of fatty acids: Linoleic Acid and Linolenic Acid
Carbohydrates:
Seven kinds of major elements: Potassium, sodium, calcium, magnesium, sulfur, phosphorus, chlorine.
Eight kinds of trace elements: Iron, iodine, zinc, selenium, copper, chromium, molybdenum, cobalt.
Fourteen kinds of vitamins: Vitamin A, vitamin D, vitamin E, vitamin K, vitamin B1, vitamin B2, vitamin B6, vitamin C, niacin, pantothenic acid, folic acid, vitamin B12, choline, biotin.
Add water, a total of more than 40
Including carbohydrates, lipids and proteins because many requirements, the proportion in the diet is material, known as the "macronutrients" needed minerals and vitamins due to the relatively small proportion in the diet is also smaller, called "micronutrients"; There are seven kinds of minerals in the human body more content, called "constant element", there are eight kinds of content is less in the human body, called "trace elements."
These nutrients in the body there are three functions:
1. The supply of life, labor and energy required for tissue cell function;
2. Provide the body's "building blocks" for the composition and repair body tissues;
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