Avocados are often maligned as the fattiest of fruits, but the monounsaturated fat they supply can actually help reduce both total cholesterol levels and LDL, or bad, cholesterol levels. Avocados are cholesterol and sodium free, and a 1-cup serving provides 10 g of dietary fiber, 12.5 g of carbohydrates and 3 g of protein. Avocados are excellent sources of potassium and magnesium, and they supply a variety of essential vitamins. The Centers for Disease Control and Prevention recommends choosing unblemished firm fruit that yields lightly to pressure. Although this fruit is rich in nutrients, it has to be eaten in moderation to avoid highly increased cholesterol.