Omega 3's are essential fatty acid that cannot be made by the body. Food sources include salmon, tuna, halibut, sardines, herring, makeral, algea, krill, plant sources and nut oils. Omega 3's play a crucial role in brain development and reduce inflammation. They lower the risk of chronic diseases like arthritis, cancer and heart disease. Most American diets are high in Omega 6 and low in Omega 3, which causes inflammation in the body, and predisposes people to chronic disease.