The risk of gestational diabetes increases significantly if the body is obese before pregnancy; 4. Long-term excess nutritional intake during pregnancy and the presence of obesity can often lead to gestational diabetes; 5. Increased secretion of glucagon by the placenta after pregnancy can antagonize the effect of insulin leading to insulin resistance, which can cause an increase in blood glucose. Therefore, women after pregnancy are advised to eat a light diet, avoid the intake of high-calorie, high-fat foods, and avoid obesity can reduce the occurrence of gestational diabetes to a certain extent.