Metabolism is a general term for all chemical reactions in living cells, which includes both material metabolism and energy metabolism. The metabolism of various organisms is different in the stages of growth, development and aging. Young infants and adolescents are in the process of growing their bodies and need more substances to build their own organisms, so metabolism is vigorous and anabolism dominates. In old age and later life, human body functions are deteriorating, the metabolism is slowing down, and the primary and secondary relationship between anabolism and dissimilation is also transformed. Young babies, teenagers are growing body process needs or hyperthyroidism and other diseases caused. The metabolic cause of the change in their own digestive and gastrointestinal functions of the exuberance of the relevant, to see if there is anomalous wasting, and their own heredity has a certain relationship, should not matter, pay attention to observe the situation of reasonable adjustment of the diet, in fact, there are a lot of factors are not pathological, physiological abnormalities in their own hyperactive physique also have such a phenomenon, the specific problem of specific treatment.