Energy: The energy intake and consumption of pregnant women should be kept in balance, and the whole pregnancy process will increase by about12kg, and the weekly weight gain in the second and third trimesters will be no less than 0.3kg and no more than 0.5kg. Therefore, the China Nutrition Society recommends that the energy of pregnant women increase by 836.8kJ per day.

Protein: The requirement of protein during pregnancy increases with the prolongation of pregnancy. The Nutrition Society of China suggested that the added value of protein during pregnancy is: 5 grams per day in the first trimester (1~ 3 months), 15 grams per day in the second trimester (4 ~ 6 months) and 20 grams per day in the third trimester (7 ~ 9 months), and high-quality protein (meat, fish, eggs, milk,

Fat: Pregnant women need to consume proper amount of fat to ensure normal fetal development and absorption of fat-soluble vitamins. Proper fat storage is beneficial to postpartum milk secretion, and about 2 ~ 4 kilograms of fat should be stored during pregnancy. The fat energy supply of pregnant women accounts for about 20% ~ 30% of the total energy. If pregnant women find that blood lipids increase, they should properly control their fat intake.

Carbohydrate: Glucose is the only energy source for the fetus, which consumes more maternal glucose, and the synthesis and decomposition of liver glycogen increase in the second half of pregnancy, so the demand for carbohydrate increases. If the maternal intake of carbohydrates is too small, such as pregnant women with severe pregnancy reaction, it is easy to cause fat oxidation function, resulting in a perfect body, which has a negative impact on fetal development. Pregnant women should try to eat cereals and fruits rich in carbohydrates.

Calcium: Pregnant women's calcium is used for fetal bone and tooth development. The China Nutrition Society recommends that the intake of calcium is 800 mg per day in the first trimester, 1000 mg per day in the second trimester and 1200 mg per day in the third trimester.

Iron: Pregnant women should pay special attention to iron supplement, which needs about 25 mg per day in the second trimester and 35 mg per day in the third trimester.

Zinc: Adequate zinc intake in pregnant women can promote fetal growth and prevent malformation. The intake of zinc in the first trimester is 1 1.5 mg per day, and it should be increased by 5 mg per day in the second and third trimesters.

Vitamins: A lot of vitamins are needed during pregnancy to meet the needs of fetal growth and development, especially folic acid and vitamin B 12. Folic acid plays a very important role in preventing neural tube defects, and folic acid deficiency in pregnant women can also increase the incidence of premonitory epilepsy and placental abruption. Women should supplement 400 micrograms of folic acid every day from 1 month before pregnancy to 3 months after pregnancy, but not more than 1 mg.