Lecithin is a special nutrient, and its role in the human body is as important as that of proteins, vitamins and other nutrients. Lecithin is widely found in the yolk of eggs, quail eggs and goose eggs, as well as in milk, animal liver, heart and kidneys, and soybeans and soy products. Supplementing lecithin in moderation or eating foods rich in lecithin during pregnancy can help the development of fetal brain cells and can also help delay aging, relieve stress and improve the health of the skin. Lecithin also has the effect of regulating blood lipid metabolism, and appropriate supplementation can improve hyperlipidemia and prevent atherosclerotic diseases.