Omega 3 fatty acids are needed for healthy cell membranes. Learn how much you need, good sources, deficiency symptoms, and health effects here.
— Read on ods.od.nih.gov/factsheets/Omega3FattyAcids-Consumer/

Also:

https://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/fats-and-cholesterol/types-of-fat/omega-3-fats/