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Is skipping meals a bad idea — or a secret weight-loss weapon? Should you eat low fat, or high fat? You probably could eat less added sugar, so should you eliminate it completely?

With so many competing — and often contradictory — diet trends, it can be tough to cut through the hype to find a healthy-eating plan that works for you. Check out the evidence behind each of these four increasingly popular eating styles to uncover the real deal.