Walnuts are identified as one of the 14 "Superfoods" because of it's high Omega-3-content. Walnuts are the only nut that contain significant amount of Omega-3, which can convert to EPA & DHA in our body once consumed. A current study concluded that EPA & unsaturated fats found in walnuts are good for lowering the bad cholesterol level. More, EPA is also a good nutrient for brain development.