From low to high, from single-celled organisms to higher animals and plants, from living in water to living on land, the living environment is different and the ecology is different. In this way, the required nutrients and the way of taking nutrients are also different.
Nutrition is a science that studies the effects of food on living things. 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.
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Essential nutrients include vitamins, inorganic salts, amino acids, fatty acids and some carbohydrates as energy sources.
Non-essential nutrients refer to nutrients that the body can synthesize from other chemicals, although they can also be obtained from diet.
Nutrients refer to the basic elements in food that can be absorbed and used to improve health. Some nutrients are necessary because they cannot be synthesized by the body, so they must be obtained from food. Nutrients can be divided into macronutrients and micronutrients.
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