In recent years, in clinical work, it is constantly found that pregnant women, due to the lack of knowledge of reasonable nutrition during pregnancy, appear to have excessive nutritional intake, resulting in rapid weight gain and overweight fetus at birth, for this reason, here is a brief introduction to pregnant friends about reasonable diet during pregnancy and weight gain during pregnancy. During pregnancy, many pregnant women believe that they must increase their nutrition and eat more, especially fruit intake, for fear that the baby in the womb will not have enough nutrients to nourish its growth and development. However, with the progress of society and rapid economic development, the problem people face is no longer eating and drinking, but unbalanced nutrition and over-nutrition. Nowadays, everyone has only one child, so they want their children to be the best. Therefore, “eat hard for your child” has become the credo of many mothers-to-be. Even in the early days of pregnancy when vomiting is severe, some women believe that if they vomit, they must eat back quickly, otherwise the child’s nutrition will not be able to keep up. “In fact, it is long past the era of malnutrition, and we need to face more of the problems of over-nutrition in pregnant women and excessive weight gain during pregnancy.” Excessive calorie intake during pregnancy can lead to excessive weight gain of pregnant women, and subsequently, disorders of glucose metabolism during pregnancy and increased gestational diabetes, especially for those who are obese before pregnancy and have a family history of diabetes have a more pronounced impact, and at the same time, there may be an increased risk of hypertension. In addition, excessive and rapid weight gain of pregnant women can lead to excessive fetal growth and development, increased complications after birth of huge babies (birth weight above 4000g) and increased rate of surgical delivery such as cesarean section during delivery. According to a series of foreign studies in recent years, the risk of obesity and abnormal glucose metabolism in childhood and adulthood is significantly increased when the fetus is born with high birth weight. At the 6th International Conference on the Developmental Origins of Health and Disease in 2009, Professor Karin Michels of the Harvard School of Public Health reviewed the epidemiological evidence and today’s research advances on the developmental origins of tumors. It is now clear that birth weight is associated with the development of breast cancer, childhood-onset leukemia, and childhood-onset brain tumors. However, although a large number of evidence-based analyses have confirmed the association of high birth weight with the occurrence of the aforementioned tumors, this relationship has only shown a weak association. S.?berg of the Epidemiology Research Unit at the Karolinska Institute in Sweden reported their statistical data on the incidence of premenopausal breast cancer, showing a correlation between birth weight and the incidence of premenopausal breast cancer. Of course, what goes around comes around, and if there is insufficient nutrition during pregnancy, the fetus will have limited intrauterine growth and low birth weight (less than 2500g), and the occurrence of some chronic diseases in adulthood will increase. Therefore, for the future health of the child should pay attention to reasonable nutrition during pregnancy to ensure the healthy growth of the fetus. So, how much is appropriate for women to eat every day during pregnancy? The Chinese Society of Nutrition, Maternal and Child Branch (2007) formulated the preconception and pregnancy nutrition guidelines emphasizing that in the early pregnancy period, i.e. the beginning trimester, there is no need to increase the extra calorie intake, just keep the same as before pregnancy. “Embryonic development during this period does not require too many calories, but it does require an abundance of vitamins and minerals, either in the form of folic acid-containing foods or folic acid-containing multivitamin supplements.” The recommended intake of fruits during early pregnancy is 100-200 grams per day. By mid- and late-pregnancy, the daily caloric intake can be increased by a discretionary 200 kcal. “That 200 kcal is also about the caloric equivalent of a couple of extra raw rice or two eggs or two apples, which is actually not much.” The recommended daily intake of fruit is 200-400 grams. Care should always be taken to avoid, after the early pregnancy reaction, entering the middle of pregnancy, overeating, the so-called pregnant women to consume two portions of nutrition, etc., so that pregnant women gain excessive weight, etc. In addition, pregnant women should pay close attention to the weight gain during pregnancy. According to a guideline issued by the Institute of Medicine in 2009, women of childbearing age have different ranges of reasonable weight gain during pregnancy depending on their pre-pregnancy body mass index. For pregnant women with multiple births (twins and triplets), the weight gain during pregnancy can be 17-25 kg for those with normal weight and not less than that for those who are underweight; 14-23 kg for those who are overweight and 11-19 kg for those who are obese. According to the series of studies: pregnant women with normal weight while maintaining the weight gain during pregnancy in the above recommended range, so that the least maternal and pediatric comorbidities. In addition, a study published in the American Journal of Obstetrics and Gynecology in 2009 on weight gain during pregnancy in 1656 obese women showed that weight gain during pregnancy is associated with weight recovery after delivery, and excessive weight gain during pregnancy is not conducive to normal weight recovery after delivery. Of course, the above are only general recommendations, and pregnancy care should be carried out under the guidance of a doctor for different individuals. Pregnant women with different body types should understand the above-mentioned range of weight gain during pregnancy, and pay attention to whether their weight change is within the normal range from early pregnancy, if they find that their weight gain significantly exceeds the above-mentioned recommended range only in late pregnancy, it will be too late! Remind all pregnant women: if you want a healthy baby, you should eat properly for the sake of mother and child (health). If excessive weight gain during pregnancy leads to abnormal glucose metabolism or even the development of gestational diabetes, you should consult a doctor as soon as possible and be helped by a specialist in this field to revise the recipes; if dietary management does not work, insulin should be applied promptly.