During pregnancy, we should follow the principles of eating less and more meals, balanced nutrition and diversified diet, ensuring carbohydrates and increasing quality protein and fresh vegetables, limiting daily calorie intake according to body mass index, and distributing daily calories to each meal. The daily calorie intake of pregnant women with normal body mass index is about 2000 calories, and the weight gain of the whole pregnancy is about 11.5-16 kg; the daily calorie intake of pregnant women with low body mass index is about 2500 calories, and the weight gain of the whole pregnancy is 12.5-18 kg; the daily calorie intake of pregnant women with body mass index >25% is 1500-2000 calories, and the weight gain of the whole pregnancy is 7-11.5 kg. -11.5 kg.