At present, stars can make headlines when they are pregnant and give birth to children, and the big belly photos during pregnancy are even more talk after dinner. There are bloated [down-to-earth gas gang] when they are pregnant, and there are also thin [hate gang] when they are born. Which is scientific? How much should you eat during pregnancy to gain weight reasonably? Nutrition imbalance endangers adults. People often say [one person eats, two people supplement], It is often reported that eating more is good for the baby, and the bigger the baby grows, the healthier the baby is, so that the weight of the giant baby (≥ 4 kg) reaches a new high. Before continuing the following discussion, we first clarify three concepts: nutrition: including macro nutrients (energy, protein, essential amino acids) and micronutrients (especially folic acid, vitamin A, B vitamins, iron, zinc, iodine and DHA); Undernutrition: underweight and lack of specific nutrients (mainly trace elements); Excess nutrition: Pregnant women are overweight or obese and/or gain too much weight during pregnancy. According to the nutritional status survey of pregnant women in 8 cities in China from September 2011 to March 2012, 43.2% of pregnant women had excess nutrition, However, it is worth noting that, Another 22.9% of pregnant women suffer from malnutrition. Excess pregnant women may also suffer from malnutrition at the same time. For example, during pregnancy, there are big fish and big meat every day but insufficient intake of vegetables and fruits, The problem of being overweight but lacking micronutrients may occur. A large number of studies have shown that, Early malnutrition or excess, Both may increase the risk of metabolic diseases such as obesity in the baby’s future. The fetus is exposed to unbalanced nutrients (high sugar, high fat, trace element deficiency) consumed by the mother. After experiencing and adapting to this adverse environment, It can cause permanent changes in fetal metabolic patterns and increase the risk of obesity and chronic diseases in the future. For mothers, excessive nutrition during pregnancy may lead to miscarriage, premature delivery, prolonged labor process, gestational diabetes mellitus, increased cesarean section rate, long-term obesity and related chronic diseases, such as heart disease, hypertension, type 2 diabetes, etc. How much weight gain is scientific? This shows that it is very important to manage the weight during pregnancy. Then the question arises, how can the weight gain during pregnancy be reasonable? In fact, this is related to being fat and thin before pregnancy, It can be determined according to BMI. BMI is height and body mass index, The specific algorithm can be based on this formula: BMI = weight (kg)/height (m) squared. For example, One woman was 1.6 m tall before she became pregnant, Weight 50 kg, Then her BMI is 50/1.6 ² = 19.53, It falls within the range of standard weight. According to the weight status of expectant mothers during pregnancy, Please refer to the following suggestions on weight gain during pregnancy. Weight status during pregnancy BMI ( (kg/m ²) Overall weight gain range (kg) Average weight growth range in the middle and third trimester of pregnancy (kg/week) Underweight < 18.5 ~ 180.51 (0.44 ~ 0.58) Standard weight 18.5 ~ 24.911.5 ~ 160.42 (0.35 ~ 0.50) Overweight 25.0 ~ 29.97 ~ 11.50. 28 (0.23 ~ 0.33) Obesity ≥ 305 ~ 90.22 (0.17 ~ 0.27) Pregnant weight status BMI (kg/m ²) Pre-pregnancy BMI (kg/m ²) Overall weight gain range (kg) Underweight < 18.5 ~ 25 Standard weight 18.5 ~ 24.914 ~ 23 Overweight 25.0 ~ 29.911 ~ 19 Obesity ≥ 3011 ~ 19 Don’t feel dizzy when you see so many figures. Here comes the pithy formula: in the middle and third trimester of pregnancy (after 4 months of pregnancy), [half a catty and eight taels] is the range of weekly weight gain; In the first trimester of pregnancy (the first three months of pregnancy), You may not gain weight, Even slightly lower. Of course, If there must be a number, It is best to gain no more than 2 kg. If you are overweight or obese before pregnancy, It is suggested to reduce the weight to the standard weight range before pregnancy. For women of general standard weight, weight gain during pregnancy is best controlled at about 12.5 kg. Generally for yellow race, the baby’s birth weight is best at about 6 kg. If you are pregnant with twins, weight gain during pregnancy is appropriate at 17.5 kg.