Foods containing DHA commonly include deep-sea fish and shellfish. DHA is an essential unsaturated fatty acid that helps the growth of nervous system cells and promotes brain development in young children. Foods rich in DHA mainly include deep-sea fish, such as tuna, scallop, halibut, eel, swordfish, grass carp, sardines; there are also some algae containing DHA, such as kelp and seaweed. Flaxseed, perilla, walnuts, sesame, almonds, cashews, etc., rich in alpha-linolenic acid can be converted into DHA in the body. Since DHA in deep-sea fish is mainly found in fish oil, it can be obtained in small amounts by eating fish. At present, DHA has been extracted through scientific methods, so special groups such as lactating women can supplement supplements containing DHA, but it is recommended to use it under the guidance and evaluation of a doctor, so as not to cause harm to the body.