(2) Sugar: Sugar (also known as carbohydrate) mainly provides fuel for life activities and is the main source of human energy. About 70% of people's daily energy needs come from sugar. Sugar mainly exists in rice, flour, potatoes and sugar products.
(3) Fat: Fat provides and stores heat energy for the human body, and about 20% of the energy needed by the human body comes from fat. Fat is divided into animal fat and vegetable oil.
(4) Vitamins: Vitamins are special nutrients that mainly regulate the metabolism of various substances in the human body (also known as catalysts for life). Although the demand is small, it is indispensable. Mainly including vitamins a, b, c, d, e, k, etc. Mainly from vegetables, fruits, animal offal and other foods.
(5) Minerals: Minerals (inorganic salts) mainly refer to various elements-calcium, phosphorus, potassium, magnesium, sodium, chlorine, zinc, iron, copper, iodine and selenium. Widely distributed in daily food, it is easy to be deficient if the diet is not properly prepared or partial eclipse.
(6) water: water is the most important substance in nutrients, and the human body can't get food. As long as there is water, it can last for a few days or dozens of days depending on the nutritional reserves in the body. Without water, it will die soon. Therefore, water is called the source of life.