Walnuts are brimming with antioxidants. They are rich in Potassium, Carbohydrate, Dietary fiber, Calcium, Iron, Vitamin B-6, Vitamin C and Magnesium. Walnuts are significantly higher in omega-3 fat, an essential fat. They contain Polyunsaturated and Monounsaturated fats that are healthy for the body. Add some walnuts to your diet every day to keep yourself fit and strong.