Diet pills have adverse effects on pregnancy. First of all, the consumption of diet pills during pregnancy may cause the emergence of anorexia. Diet pills for weight loss are mainly designed to regulate appetite and reduce food intake, and the consumption of too many diet pills tends to make people lose their appetite. The emergence of anorexia tends to make women suffer from malnutrition during pregnancy, which can easily lead to the emergence of miscarriage. Secondly, diet pills may also cause palpitations, insomnia hazards, diet pills contain ephedrine-like substances, easy to make people appear panic, vertigo symptoms. Diet pills also belong to a kind of nerve excitatory drugs, the use of diet pills will make the human body hyperactive, which will lead to insomnia. In addition, usually diet pills are a diuretic and contain diarrhea components of the drug, the use of diet pills often lead to excessive vomiting and diarrhea, diarrhea and diuresis can easily lead to fetal dysplasia, and even miscarriage symptoms. In short, diet pills have many adverse effects on pregnancy, so it is not advisable to use diet pills to lose weight during pregnancy.