Have you ever heard about a diet that promises you can lose twenty pounds in a week? You know the ones... the "cabbage soup" diet, the "grapefruit only" diet, or the one that promises you can just cut out one single "evil" food group and suddenly everything will be perfect? These are "fad diets," and they are everywhere. They're tempting, right? They promise a quick, easy fix. But here’s the secret they don't want you to know: they almost never lead to good health in the long run.