Tyrosinemia is also known as “congenital tyrosinemia”. It is an autosomal recessive clinical syndrome with abnormal tyrosine metabolism, severe liver damage and renal tubular defects due to fumaryl acetoacetate hydrolase deficiency. There are two main types: the neonatal type, also known as the acute type, which accounts for most of the reported cases, and the chronic type, also known as the latent type. Intermediate forms also occur. Diet and nutrition during pregnancy not only affects the normal development of the fetus, but also relates to the physical and intellectual fitness of the infant after birth. Therefore, the scientific deployment of dietary nutrition in all periods of pregnancy is of great importance for optimal pregnancy and birth. 1, to ensure that nutrients are comprehensive and adequate (1) should meet the supply of high-quality protein foods such as milk, eggs, liver, fish and lean meat. If conditions do not allow, part of it can be replaced by soy products. (2) Fruits such as hawthorn, fresh dates, oranges, wide oranges, lemons, persimmons and peaches, and various fresh vegetables such as carrots, green peppers, tomatoes, eggplants and various leafy greens are rich sources of a variety of vitamins and inorganic salts, and should be adjusted as much as possible for variety and adequate consumption. (3) The staple food should be a combination of coarse and fine grains. In addition to this, 1-2 times a week should be interspersed with iodine-rich foods, such as kelp, jellyfish, sea cabbage, nori, sea rice, shrimp skin, and fish. An ideal recipe for pregnant women should include 250 grams of milk, 2 eggs, 150 grams of lean meat and animal offal, 100-150 grams of soy products, 500 grams of vegetables, 250 grams of fruit, 400-450 grams of grain, 15 grams of sugar, and 20-25 grams of vegetable oil for cooking. The last three months of pregnancy is a sensitive period for the proliferation of fetal brain cells and fat cells, so if you can eat more milk, egg yolk, liver, fish, vegetables and soybean products during this period, so that the supply of protein, phospholipids and vitamins is sufficient, it is strongly conducive to the increase in brain cells and the intellectual development of the fetus. In addition, pregnant women in late pregnancy, eat more walnuts, sunflower seeds, sesame seeds, peanuts and other foods rich in unsaturated fatty acids, can reduce the incidence of pediatric skin disease. If you can eat foods rich in iron, vitamin B12, folic acid, such as liver, egg yolk, fungus, green vegetables and tempeh, can reduce the incidence of anemia after birth. The incidence of pediatric cretinism can be reduced by regularly eating foods rich in iodine. Pregnant women whose parents have poor intelligence or suffer from a certain nutritional deficiency, as well as those with a family history of hypertension, should pay special attention to nutritional supplements and dietary regulation during pregnancy in order to make their offspring eugenic. 3, use food to correct genetic defects The appearance and body shape of children depends mainly on the genetics of their parents, but it is possible to consume food during pregnancy to correct certain genetic deficiencies. For example, if the parents are short, choose more calcium and vitamin D-rich foods during pregnancy to promote the development of the child’s trunk and limbs, which may make the height increase; often eat some liver, sesame seeds and various colored vegetables, so that the supply of vitamin A is sufficient to promote eye development and hair growth; pregnant women’s diets often contain milk, fruit, walnuts, etc., which may make the child’s skin delicate and white.