The so-called metabolism is a normal physiological activity of the human body, that is, after eating to absorb, absorb to digest, digestion into energy, into energy, there will be enough nutrition to support the growth of the body and normal physiological activities. Excess energy is metabolized through the gastrointestinal tract, through the urinary tract, through the body’s heat, through the movement of other organs, which is called metabolism. In addition, what you eat is not always nutritious, so while absorbing nutrients and excreting and metabolizing some excess waste, it is also a process of alternating old and new. The skin and cells in the body have a metabolic cycle, for example, the metabolic cycle of red blood cells is generally about 120 days, and the metabolic cycle of the skin is about 2 weeks, which is the medical term for metabolism. Metabolism is influenced by many factors. First, the metabolic rate is different in spring, summer, autumn and winter; second, the metabolic rate of men and women is also different; there are many external factors that have an impact on metabolism. Such as drugs, some drugs for gastritis, inhibit stomach acid, but also inhibit the gastrointestinal motility. Third, some drugs for the treatment of central nervous system, in the treatment of depression at the same time control the sympathetic excitation, can also lead to a decline in metabolism. So some antidepressant drugs, treatment of gastrointestinal drugs can cause obesity, because it indirectly affects the metabolism.