There are dozens of fad diets promising quick and easy weight loss, but the truth is there’s no magic formula, powder or pill to melt away weight. The trick is really no trick at all: A reduced-calorie diet coupled with exercise. You don’t have to deprive yourself of your favorite foods or sweat for hours to see results, either. In fact, experts often advise that you shouldn’t make changes you can’t sustain over the long term. If you get frustrated, you’re more likely to give up.