Nuts are a delicious, crunchy snack and a great source of healthy fats and nutrients. Walnuts, specifically, are a rich source of Omega-3 fatty acids and are low in calories. They are great to have around for a snack or for adding to your salad.Shelled walnuts are a good source of protein, healthy fats, and antioxidants. They are a healthy snack to consume because they are high in healthy unsaturated fats and low in cholesterol.