What is a reasonable nutrition?

What is nutrition, what nutrients are and what is a reasonable nutrition

Nutrition refers to the body from the outside world food intake and the use of the nutrients they contain life-sustaining activities. Is the nutrients in food ingredients. The body through food intake with the outside environment, and through the effective use of nutrients to maintain their structural integrity and environmental stability.

Nature of the food available for human consumption a wide variety, different function. But the day-to-day maintenance of the human body needs only the type of nutrients: protein, carbohydrates, fats, minerals (also known as salts, can be divided into two types of major elements and trace elements), vitamins, food and water, cellulose 7 categories, a total of About 40 species. They have their special physiological functions, participate in the activities of the body's metabolism. Nature of any single type of natural food can provide all the nutrients the body must be a variety of food with each other by a certain percentage in order to meet the nutritional needs of the human body and reasonable. Therefore it is reasonable to emphasize nutrition: the supply of food for human consumption should be contained in the full range of nutrients, appropriate content, appropriate proportion.