Vaccination does not increase weight, there is no scientific reasoning and basis. Human obesity is mainly due to irregular eating habits and habits, heredity, endocrine disorders and other reasons. There are many kinds of vaccines, there is a national vaccine class II vaccine, vaccine inoculation of the human body can stimulate the body’s immune response to produce antibodies, so as to avoid the human body to get the corresponding disease, play a preventive role. The human body after vaccination can appear some slight fever, local pain, itching, etc., and does not have the role and efficacy of fertilization, no scientific reason and basis. Human obesity has a variety of reasons, such as regular overeating, lack of exercise, family genetics and a variety of endocrine diseases, etc., can appear human obesity, but with the vaccine has nothing to do. The human body after vaccination if there are some adverse reactions, need to go to the hospital for treatment.