The idea is that the fasting induces mild stress to the cells in your body, helping them become better at coping with such stress and possibly helping your body grow stronger. The verdict is still out regarding the diet’s long-term effectiveness with weight loss, according to a review of preliminary animal research published in January 2017 in Behavioral Sciences. (17)

Yet there is value in having a variety of diets to choose from, and in tailoring eating plans to help people with specific health concerns — such as diabetes or obesity — manage their conditions, says Andrea Giancoli, a California-based registered dietitian who, along with Katz, consulted on U.S. News & World Report‘s annual ranking of best diets this year. Comparing diets in this way may help steer people away from ineffective or unsustainable fads, Giancoli says.


Whether your reason for going vegetarian is ethical, environmental, or for health, one thing's for sure: weight loss can be a nice bonus. In fact, in that same study that evaluated vegan, vegetarian, and omnivorous diets, vegetarian diets were almost as effective as vegan—helping people lose 6.3 percent of their body weight compared to 7.5 percent in the vegan group in a half year. Bonus: perfection isn't necessary. Even if you fall off the wagon and break your diet (hey, it happens!) another study found that dieting vegetarians still lost more weight than dieting meat eaters. 

Have Protein at Every Meal and Snack. Adding a source of lean or low-fat protein to each meal and snack will help keep you feeling full longer so you're less likely to overeat. Try low-fat yogurt, small portion of nuts, peanut butter, eggs, beans, or lean meats. Experts also recommend eating small, frequent meals and snacks (every 3-4 hours), to keep your blood sugar levels steady and to avoid overindulging.
The best low-cal diet plan isn't a diet so much as it is a method. CICO stands for "calories in, calories out" and is based on the mathematically sensible principle that as long as you're burning more calories than you're eating, you'll lose weight. All you need to get started is a way to track your calories—there are plenty of apps on the market although a pen and paper works great too—and a food scale to keep you honest about your portion sizes. (Also read this guide on how to safely cut calories to lose weight.) People love the simplicity and straightforwardness of the plan. And while it may not be the fastest way to lose weight, you're guaranteed to have success long term. (Just know that some weight-loss experts actually don't recommend calorie counting.)

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