Usually during the first trimester of pregnancy, nausea, vomiting or loss of appetite will occur due to pregnancy reactions, and you will not gain weight too fast. In the middle of pregnancy, it is easy to cause an increase in appetite and eat especially large amounts of food, which will easily lead to gaining weight. In the middle of pregnancy, the fetus is relatively stable, you can participate in outdoor sports in moderation, more exercise can promote metabolism, to avoid growing too fat. When choosing food during this period, you should also try to pay attention to control the diet, do not eat food containing too much fat, such as fat, butter, lamb fat, these fats are not easily absorbed by the fetus, will remain in the body of pregnant women cause too obese. Try to choose foods with less calories, you can choose high-quality protein in moderation to eat fish, chicken, milk, and eat a moderate amount of fresh fruits and vegetables, will not let pregnant women grow too fast.