This meal replacement plan has mixed scientific evidence to support it. SlimFast promises a reasonable one- to two-pound loss per week, but you’ll need to buy its shakes, bars, and other products. The 1,200-calorie plan allows for one 500 calorie meal of regular food daily, with the rest of the calories made up of SlimFast products, fruits, and vegetables. The hard part will be sticking with the program; also, the SlimFast foods contain a lot of processed ingredients and artificial sweeteners. This isn’t for people younger than 18, or pregnant or breastfeeding women without medical supervision. Make the most of your one meal with 11 simple swaps that lead to dramatic weight loss.
The Mayo Clinic health experts designed this plan to produce long-lasting behavior change—and lasting weight loss. You can lose six to ten pounds in the Lose It phase by adding healthy habits and ditching unhealthy ones. Food choices are built around the Mayo Clinic Healthy Weight Pyramid and bulky, low-calorie foods that fill you up fast—an idea that scores well in studies. The Live It phase teaches more advanced weight-loss skills to help make it stick. This diet plan’s main restrictions are to eat out less, not expect overnight weight loss, and seek your healthcare professional’s approval before starting. Don’t miss these 13 weight-loss foods that will help you shed pounds fast.
This high-fat, adequate-protein, low-carb fad diet sends the body into a state of ketosis, in which the body uses stored fat for energy. Research published in Clinical Cardiology suggests the ketogenic, or “keto,” diet can be an effective weight loss method, but to be successful, you must follow the plan consistently with no cheat days — otherwise, you’re just eating a high-fat diet that may be high in unhealthy fats for no reason. (1) (A pro tip? If you're planning on doing the diet, consider perusing this complete keto food list and reading up on the healthiest fats for keto diet followers.)

There are many ways to do intermittent fasting — ranging from fasting for a number of hours each day up to an entire 24-hour fasting period one or two times a week. “If you're trying to kick a habit like eating late into the night, then stopping eating earlier in the evening and fasting overnight could be beneficial for you,” says Hultin. “There are many types of intermittent fasting, so ensuring you pick one that works for you and your lifestyle is important.”

The plan promotes long-lasting, sustainable changes, and undoubtedly a bounty of research backs this up. In fact, one December 2013 study in the American Journal of Medicine shows that people following Weight Watchers were close to nine times more likely to lose 10 percent of their body weight, compared to people following a self-help diet plan. (20)
Notes: Chop the sweet potatoes and halve the Brussels sprouts, and place on a sheet pan. Drizzle with 2 teaspoons olive oil, season with salt and pepper, and toss to coat. Roast at 450°F (230°C) until tender, about 15 minutes. Brush the chicken with 1 teaspoon olive oil and season with salt and pepper. Grill over medium-high heat until marked and no longer pink in the center, about 5 minutes per side.
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