Being too fat can have an effect on pregnancy in a number of ways, mainly in terms of difficulty in conceiving naturally, difficulty in ovulation, and increased risk of miscarriage. Obesity can cause abnormal response between sperm, egg, embryo and endometrium, thus making natural pregnancy difficult. In addition, obese individuals can often be comorbid with polycystic ovary syndrome, which can result in scanty menstrual periods, difficulty ovulating, and a reduced pregnancy rate when ovulation is promoted. In vitro fertilization in obese people, implantation rate and pregnancy rate will also be reduced, and the risk of miscarriage is increased. Therefore, it is relatively difficult to get pregnant either naturally or through assisted conception techniques. Even if pregnancy is successful, obese patients will be more prone to gestational hypertension, pre-eclampsia, gestational diabetes and other diseases during pregnancy. For those who are too fat, it is recommended to make timely lifestyle changes to reduce weight and insulin resistance, so that the reproductive endocrine abnormalities can be significantly improved. Dietary control should be carried out on a daily basis to avoid high-calorie foods, as well as to strengthen sports and exercise, etc.