With the improvement of living standards, we all pay more and more attention to nutrition supplementation during pregnancy, many families will give pregnant women deliberate nutrition, but nutrition is not the more the better, the right amount is the best. Deliberate control over diet, nutritional deficiencies and imbalances can cause fetal growth restriction, miscarriage, premature birth and other increased risk; excess nutrition will cause maternal obesity, more likely to have high blood pressure, diabetes, cesarean delivery and other problems, as well as newborn hypoglycemia. So, how much nutrition is needed during pregnancy? One of the most intuitive and easy to measure is the weight gain. The amount of weight you need to gain during pregnancy varies depending on your pre-pregnancy nutritional status. The following steps can be used to estimate how much weight gain is ideal for you during pregnancy. 1, calculate the body mass index (BMI) pre-pregnancy weight (kg) / height squared (m) normal for 18-24kg. below this standard, it means thin, above this standard, it is overweight or even obese. 2, BMI <18, weight gain of about 20kg during pregnancy is appropriate 18< BMI<24, suitable for weight gain 12-17kg BMI>24, weight gain 8-11kg is more appropriate. 3. The range of weight gain for twins and multiple births should be assessed according to the number of fetuses and nutritional status. Refer to the dietary nutrition pagoda for nutrition and calorie ratios. Carbohydrates (mainly provided by rice, pasta, cereals and potatoes) should account for 50-60% of the total daily food intake. Weight gain during pregnancy is not uniform. For a normal weight person, a weight gain of 1 to 2 kg during the first trimester is appropriate. A study in Denmark found that poor nutrition in early pregnancy has a higher chance of diabetes and hypertension after birth or in later life. Therefore, if the early pregnancy reaction is heavy and affects eating, it is advisable to eat less and eat more, vomit and eat more food that is beneficial to the child’s brain development. Protein, inorganic salts, vitamins and sugar are all essential ingredients for the development of the fetal brain, so pregnant women should diversify their food and should not abstain from eating too much. Many pregnant women start to eat a lot to make up for the shortage in the first period after the pregnancy reaction stage, when their appetite improves, which is also wrong, the fetal growth and development has its own rules, excess nutrition will only be absorbed by the mother, resulting in obesity. The best way to gain weight is to increase slowly but steadily. In the middle and late stages of pregnancy, it is appropriate to control the weight gain to about 0.5kg per week for a normal size person. Too slow or stagnant weight gain without growth may indicate the presence of a fetal growth lag, making it easy to deliver low-weight children who are prone to a variety of diseases; too much or too fast weight gain during pregnancy likewise increases the risk to mother and child. For pregnant women, too much weight gain, gestational diabetes and even gestational hypertension are likely to occur during pregnancy, and obesity and diabetes are likely to occur after delivery; for the fetus, it is easy to have a huge fetus (birth weight greater than 4 kg), and the risk of stalled labor, obstructed labor and even birth injury increases during vaginal delivery of a huge baby, and doctors have a greater chance of choosing cesarean section for delivery, and the postpartum period is also prone to neonatal The risk of neonatal hypoglycemia and neonatal respiratory distress syndrome is high. Therefore, it is not better to eat as much as possible in the middle and late stages of pregnancy, but rather to focus on the quality of the diet rather than the quantity. At this stage, the development of fetal tissues and organs is becoming more and more perfect, and the blood volume and basal metabolic rate of pregnant women are gradually reaching their peak, so the intake of protein and calories should be increased appropriately; at the same time, as the fetal bone development is in the formation period, the supplement of calcium, iron and other trace elements should be increased. As constipation often occurs during pregnancy, so the diet should not be too refined and attention should be paid to supplementing fiber. A proper diet and balanced nutrition are very important for a safe and smooth pregnancy. The general principles of diet during pregnancy are: not too sweet, not too salty, not too greasy, not too spicy, light and varied, and increase dietary fiber. Pregnant women who are in a position to do so can consult a nutritionist to adjust their diet during pregnancy. Warm tips: obese pregnant women have a greater chance of diabetes, hypertension, hyperemesis, venous thrombosis complications during pregnancy, so if you are preparing to get pregnant, it is best to lose weight first. However, if pregnancy has been detected, it is not advisable to lose weight during pregnancy and weight gain should be properly controlled under the guidance of a dietitian.