Most people pay attention to nutritional supplements during pregnancy, but it is easy to ignore the nutritional supplements for both spouses before pregnancy. It is not known that pre-pregnancy nutrition is equally important for eugenics, because pregnant mothers will have brief nausea, vomiting and other pregnancy reactions in early pregnancy, and the amount of nutrition needed by the mother for embryo development at this time is small but needs to be comprehensive. If the pregnant mother is partial to food before pregnancy or her diet has an unreasonable nutritional structure, the stored nutrients during pregnancy are insufficient and may affect the development of the embryo. In addition, the growth and movement of sperm also need rich protein, calcium, zinc and multivitamins, etc. The father-to-be should also pay attention to nutrition before pregnancy. The parents-to-be should arrange their diet reasonably, eat regularly and diversify their meals before pregnancy. The dietary principles for couples who are overweight or obese before pregnancy are a low-calorie, low-sugar, low-fat diet, an appropriate increase in the intake of protein-rich foods (such as fish and shrimp, lean meat, milk, eggs and soy products), and more intake of fresh vegetables. The dietary principles for those who are underweight before pregnancy are to increase the amount of diet appropriately, diversify the types, match nutrition reasonably, and consume more foods rich in high quality protein and fresh vegetables and fruits rich in vitamins. Those who are anemic before pregnancy should also make purposeful dietary adjustments and eat more iron-rich foods, such as beef, animal liver and green vegetables. Also mothers preparing for pregnancy need to take folic acid supplements. Studies have found that folic acid deficiency in pregnant women is the main cause of the occurrence of fetal neural tube malformations. It may also lead to an increased incidence of malformations of the eyes, mouth and lips, palate, gastrointestinal tract, aorta, kidneys, bones and other organs. Severe folic acid and vitamin B12 deficiency can also cause macrocytic anemia, which affects the health of the mother and child. As early as 2007, the Chinese Nutrition Society pointed out in its Dietary Guidelines for Chinese Residents that women of childbearing age should take a daily supplement of 0.4 mg of folic acid from the first three months of pregnancy and continue throughout pregnancy. You can also eat foods rich in folic acid, such as asparagus, broccoli, beans, egg yolk and animal liver.