Betty Johnson is a diet buff and writes a lot about eating the right food to make you healthy. She is a big fan of foods such as apples. Not only are apples good for you, they can actually replace butter and eggs in your cooking and baking. One-quarter cup of applesauce can replace a single egg in any recipe, while one-half cup of applesauce replaces one-half cup of butter. Easier on your heart and lower in calories, this substitution is perfect for people making the switch to a heart-healthy diet. It is also an excellent way to make baking recipes vegan-friendly. She also loves eating potatoes. Instead of choosing French fries, tater tots, or potato chips, opt for a baked potato with a small dab of margarine and fat-free sour cream. Fried foods are higher in calories and cholesterol, so this quick switch is easy and doesn't take away from the flavor of your meal.