It is usually not recommended to lose weight during pregnancy because losing weight during pregnancy may affect the growth and development of the fetus, so try to choose to lose weight after delivery. However, if you were heavy before pregnancy or gained too much weight during pregnancy, you can control your weight by controlling your diet and doing proper exercise. When pregnant, because the fetus needs to take a lot of nutrients from the mother for growth and development, a pregnant woman needs to assume the nutritional needs of herself as well as the fetus. Therefore, it is necessary to increase the nutritional intake during pregnancy and not to lose weight by dieting to prevent malnutrition of the fetus, which will affect normal development, and not to use weight loss products during pregnancy to prevent harmful ingredients in drugs from crossing the placental barrier and affecting the health of the fetus, leading to fetal malformations. If you are too obese or gain weight too fast before pregnancy, you can control your diet properly, develop good eating habits, avoid excessive consumption of potato chips and other high-calorie snacks to prevent excess nutrition, and it is advisable to eat more vegetables rich in dietary fiber, such as broccoli, spinach, etc. You can also do appropriate exercise, such as slow walking, swimming, yoga, etc. In addition, it is necessary to avoid intense exercise and excessive exercise during pregnancy, which may lead to severe contractions of the uterus and increase the risk of preterm delivery and spinal damage.