Level 1: What is linolenic acid? Linolenic acid is an essential fatty acid that the human body cannot synthesize by itself and needs to be ingested from food. It is one of the important components of the Omega-3 series, which can lower blood lipids, prevent cardiovascular diseases, improve immunity, etc. Level 2: Why do pregnant women need linolenic acid? Pregnant women need more nutrients during pregnancy to support fetal growth and development, including linolenic acid. Linolenic acid can promote fetal nerve development and prevent premature birth and low birth weight. Level 3: Which foods are rich in linolenic acid? Foods rich in linolenic acid mainly include flaxseed and rapeseed oil