1. Low-calorie diet
Defined as: Only consuming 800 to 1,200 calories a day.
Pros: The sole purpose of limiting your daily calories (and pushing the boundaries of sanity) is to lose weight ASAP—and the study analysis says it works, while also preserving as much lean muscle mass as possible.
Cons: In our experience, capping your calories low will probably mean a lot of internal strife and stress. Plus, we’re big fans of enjoying food instead of fearing it, and 800 calories doesn’t leave much room for satisfied taste buds. Lastly, if you’re currently eating double to triple this amount of food, dropping to a daily caloric intake this low can tank your metabolism and actually slow weight loss more than switching to one of these other diets might. (Curious? Here’s why starving yourself won’t help you lose weight.)
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