Mom was right! What you might have called the "yucky white part" and picked off of your peeled orange sections when you were a kid is actually good for you. So, stop tossing it out with the peel and eat it along with the fleshy and juicy sections of your citrus fruits (oranges, grapefruits, lemons, etc.) It is called the "albedo." The albedo is a good source of fiber and vitamin C. It is also rich in pectin which has proven to help lower cholesterol.