Eggs: An egg is one of the most complete and versatile foods available. It has a valuable role in providing a healthy diet for all. One large egg contains 6 grams of protein and only 70 calories. If you're concerned about cholesterol, many egg substitutes on the market offer lower-cholesterol alternatives that still pack a protein punch. One of the best ways to eat eggs is hard-boiled. Keep a bowl of them in your home fridge for an instant healthy snack or addition to a larger meal.