Lactic acid buildup does not usually lead to weight gain, and if a patient experiences weight gain it should be considered to be due to other causes. The production and accumulation of lactic acid is most often considered to be an intermediate product of glucose metabolism during exercise, at the expense of glucose depletion in the body. If lactic acid continues to be metabolized, the substance is further broken down into carbon dioxide and water, which can be carried out of the body through respiration and perspiration, and may lead to weight loss rather than weight gain. If a patient has weight gain, it should not be considered as a result of lactic acid accumulation, but rather as a result of excessive calorie intake, metabolic disorders, etc. It is recommended to consult a doctor to develop a scientific approach to weight loss.