Pregnant women can take linolenic acid because it is beneficial to the mother and fetus and cannot be synthesized through their own synthesis, and must be supplemented by additional intake. Linolenic acid is a factor necessary to maintain brain and nerve function, and its metabolites ARA and DHA are beneficial to brain health and intellectual development. If a pregnant woman lacks linolenic acid, it may affect the brain development of the fetus, on the contrary, the right amount of linolenic acid intake during pregnancy, for the fetal nervous system and brain development is beneficial. In addition, linolenic acid for fetal vision development also has a certain role in promoting the appropriate consumption of pregnant women to help the development of the fetal retina. In addition, linolenic acid also has the role of regulating blood lipids, regulating blood pressure, enhancing immunity, etc., appropriate consumption by pregnant women can help prevent or alleviate pregnancy-related diseases. Therefore, it is recommended that pregnant women should take linolenic acid under the guidance of a professional doctor, according to their physical condition. Linolenic acid should also be supplemented in appropriate amounts during breastfeeding, so that the baby gets enough nutrition from breast milk. Most of the foods rich in linolenic acid in daily life are algae, as well as fish, shrimp and shellfish that feed on seaweed. Some of the seeds of land plants are also rich in linolenic acid, including perilla seed oil, linseed oil and other vegetable oils, linolenic acid content of up to 50% or more. Other vegetable oils, such as walnut oil, soybean oil, vegetable oil also contains about 10% of linolenic acid, animal oils in the content is very low, generally less than 3%. Although the content of linolenic acid in green vegetables is low, but it is the main source of human body to obtain linolenic acid.