Nuts are high in Polyunsaturated and Monounsaturated Fats. Monounsaturated fats are believed to improve blood cholesterol levels. Polyunsaturated Fats are also believed to improve blood cholesterol, however; this Fat is also known to help lower the risk of type 2 diabetes. Walnuts in particular, contain a Fatty Acid known as Omega-3 (found in some Polyunsaturated Fats), which is suggested to be extremely beneficial for your heart. Along with having beneficial fats, nuts also contain many Vitamins and Minerals.