① Main places for storing and supplying energy. Body fat is mainly distributed in subcutaneous tissue, small intestine membrane, large intestine membrane and adipose tissue of some internal organs, which provides reserve energy for various sports of human body, so it is usually called "fat bank". Why provide backup energy? This is because the energy consumed by the human body comes from glycogen first, and only when the glycogen content in the blood is reduced to a certain extent can body fat be utilized; But if glycogen in muscle and liver can meet the needs, body fat will not be easily used passively.
② Fat can protect internal organs from external shocks. There is a lot of fat under the skin and around the viscera, which becomes a natural barrier between the viscera and the outside world and can reduce the impact of the outside world. At the same time, fat can also fix internal organs and prevent sagging.
③ Fat has an important protective effect on human body temperature. The human body temperature must be kept at around 37℃ all the year round. Too high or too low body temperature will cause the disorder of aging and affect the normal physiological function of human body. The ability of fat to conduct heat is very weak, and it has the function of keeping body temperature.
④ Some vitamins and trace elements necessary for human body are insoluble in water, and can only be absorbed and utilized by human body if they are dissolved in fat. If there is no fat, these nutrients will not be used and can only be wasted.
⑤ Fat is an important source of secretion of various glands in human body, especially promoting the secretion of bile and glandular islands. Make an important contribution to the normal physiological function of the human body.
⑥ Lipids (cholesterol and phospholipids) contained in fat are important components of human cell membrane and brain tissue, which are of great significance to the normal function of human cells and the transmission of stimuli.