Nutrition is the need for the human body to maintain life and health, to ensure the growth and development of the body, physical activities and learning and thinking, and it is necessary to continuously absorb necessary nutrients from food. Only by reasonably matching and absorbing these nutrients can we maintain normal life activities and good health.
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In its development process, nutrition not only includes the changes of food entering the body, such as participating in biochemical reactions and combining with tissues and cells; It also includes instructing people how to choose food to ensure the normal growth, development and reproduction of the body. Therefore, nutrition has not only biological significance, but also social and economic significance.
Nutrients are essential food ingredients to maintain normal life activities. The study of nutrients in modern nutrition is mainly aimed at the nutritional needs of people and livestock. Nutrients are divided into seven categories: protein, lipids, carbohydrates, vitamins and minerals, water and dietary fiber.
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