The purpose of diet control in gestational diabetes is to provide adequate calories and nutrients to the mother and fetus, so that the mother and fetus can gain weight appropriately, meet ideal glycemic control, prevent toxemia in pregnancy, and reduce the occurrence of preterm labor, miscarriage, and obstructed labor. The nutritional requirements are the same as those of normal pregnant women, except that more attention must be paid to the intake of calories, the distribution of nutrients and the distribution of meals. The caloric requirement does not need to be increased in the first trimester, but must be increased by 300 calories/day in the second trimester according to the pre-pregnancy caloric requirement. Since weight loss may increase ketone bodies in the mother’s body, which may adversely affect the fetus, it is not advisable to lose weight during pregnancy. To maintain a stable blood glucose level and to avoid ketosis, meal distribution is very important. Because eating a large amount of food at one time can cause a rapid rise in blood glucose, and because ketone bodies are easily produced when the mother is fasting for too long, it is recommended to divide the daily food intake into five to six meals in small portions. It is especially important to avoid a long gap between dinner and breakfast the next day, so take a snack before bedtime. The intake of sugars is to provide calories, maintain normal metabolism, and avoid ketosis. It should not be mistaken that not eating starch can control blood sugar or body weight, so you should not eat at all; instead, you should try to avoid sugary drinks and sweets with sucrose, sugar, fructose, glucose, rock sugar, honey, and maltose to avoid a rapid increase in blood sugar after meals. If necessary, you can add a little sugar substitute, but it should be harmless to the fetus. It is recommended that you try to choose unrefined staple foods with a high fiber content for better blood glucose control, such as brown rice or grains instead of white rice, whole grain bread or buns, etc. The morning blood glucose level of pregnant women with gestational diabetes is higher, so the breakfast must contain less starchy foods. If you have taken enough nutrients before pregnancy, you do not need to increase the amount of protein in the first trimester. In the middle and second trimesters, you need to increase the amount of protein by 6 grams and 12 grams each day, half of which should come from proteins with high physiological value, such as eggs, milk, dark red meat, fish and soybean products such as soy milk and tofu. The oil used for cooking should be mainly vegetable oil, and reduce fried, deep-fried and crispy food, as well as animal skin and fatty meat. Within the range of intake, consume more high-fiber foods, such as brown rice or grain rice instead of white rice, increase the intake of vegetables, and eat fresh fruits instead of fruit juice. But do not eat unlimited amounts of fruit.