Walnuts are high in protein, vitamins, omega 3 fatty acids, trace minerals, lecithin and oils. Compared with other nuts, which typically contain a high amount of mono-unsaturated fats, walnuts are unique because the fats in them are primarily poly-unsaturated fatty acids (PUFAs) and are the only nut with a significant amount of alpha-linolenic acid. Moreover, walnuts have insignificant amounts of sodium and are cholesterol free.