It is best not to lose weight during pregnancy, unless you are overweight, you can control your diet properly, exercise more every day, and control your weight within a certain range. Excessive weight loss is not conducive to the absorption of fetal nutrition. You can't use diet pills or do strenuous exercise during pregnancy. You need to pay attention to a balanced diet, reasonable nutrition, and ensure the nutritional supply of the fetus, so as to avoid insufficient nutritional intake due to weight loss and affect the growth and development of the fetus. Of course, don't be overnourished during pregnancy. Generally, the weight can be controlled not to exceed 25 kg during pregnancy. If you gain too much weight, it may also lead to an increase in blood lipids or blood sugar.