The plan is simple: Commit to two weeks of restricted dieting, then transfer to a sustainable regime. Phase one: Cut out restaurant food, added sugar, eating while watching TV, snacking on anything other than fruits and veggies, and limit meat and dairy. You’re also asked to add four healthy habits, simple tweaks like having a good breakfast every morning.
Real talk: It could take weeks or months to see the metabolic effects of exercise on the scale, and even then, building muscle, which is denser than body fat, could lead to weight gain. "Do what you like because it’s good for you," Dr. Seltzer says, noting the way exercise is awesome for your heart, mental health, and more—and that not all measure of progress can be seen on the scale.
Protein is naturally filling and takes longer to digest than simple carbohydrates. When people drank a whey protein drink, they lost about 4 pounds more and about an inch more from their waists over 6 months and felt less hungry than people given a carbohydrate shake instead. Other research in mice, found that when mice were given extra whey protein they gained less weight and body fat and more lean muscle, even when calories were the same. Whey protein is found naturally in yogurt and other dairy.
If your favorite foods fall into the list of forbidden fruit, you’re even more likely to fall off the wagon. Giancoli gives the example of diets that cut out coffee: “It’s ridiculous. There’s a lot of research that coffee is fine. Coffee’s been redeemed.” The Mayo Clinic goes even further, saying: “Caffeine may slightly boost weight loss or prevent weight gain.”
Consider a diet's overall approach to food. What will you be eating every day? Is there much variety, or will you be eating the same foods frequently? If most (or even some) of the foods on a plan aren't enjoyable, within your budget, or readily available, you're going to find a particular plan hard to stick with. Ask yourself: realistically, could you eat the foods on this plan more or less for the rest of your life?
You may think hand sanitizer will zap germs and prevent you from getting sick, but it could also be making you fat. Hand sanitizer contains triclosan, which researchers have found to be an “obesogen,” meaning it could cause weight gain by disrupting your body’s hormones. A study published in the journal PLOS One found that people who had detectable levels of triclosan in their bodies were associated with a 0.9-point increase in body mass index (BMI). If you’re really worried about germs, it’s best to rely on good ol’ soap and water.
Preferred tastes: Think about whether the foods on a given diet are things that you generally enjoy. If you hate eating your greens, you might not like a diet filled with salads; but if you have a sweet tooth, a diet that substitutes milkshakes for meals might be more up your alley. Ask yourself whether you will enjoy the foods on a given diet, or if it will feel like a “diet” food that you won’t be able to stick with long-term.
Nuts were also among the top 5 foods that promote weight loss according to Harvard. That's probably because peanut butter and all nuts and nut butters deliver a good dose of healthy fats, fiber and protein—all satisfying nutrients. Nuts used to get a "bad" reputation for being high in calories and fat. And while nuts and nut butters are calorie dense—2 tablespoons of peanut butter has just under 200 calories, 7 grams of protein and 2 grams of fiber—they're also nutrient dense and help you build a satisfying breakfast.
Also some research shows that the human body is primed to consume most of its calories during daylight hours. But the lifestyle is problematic for many: Because family meals and dinners with friends often are scheduled for after sunset, "people who try to stop eating after 7pm can’t do it every day for the rest of their lives," says Dr. Seltzer, who supports an alternative strategy: Eating a hearty meal at your regular dinnertime.
"Anytime you’re stressed, you probably go for food," Dr. Seltzer says. (Have we met?!) That’s because cortisol, the stress hormone, stokes your appetite for sugary, fatty foods. No wonder it’s associated with higher body weight, according to a 2007 Obesity study that quantified chronic stress exposure by looking at cortisol concentrations in more than 2,000 adults’ hair.
Studies have found that overweight people who ate a moderate-fat diet containing almonds lost more weight than a control group that didn’t eat nuts. Snacking once or twice a day is one of the ways to lose weight that helps stave off hunger and keeps your metabolism stoked. You can also pack up baby carrots or your own trail mix with the healthiest nuts you can eat, plus raisins, seeds, and dried fruit. Here are 30 healthy snacks that can help you lose weight.
Try upping your fiber intake—it may work just as well as following a strict diet. In an American Heart Association study, one group was instructed to follow a diet with strict nutrient goals and limits on calories, sugar, and saturated fat, while the other group was given one goal: consume 30 grams of fiber a day. At the end of the 3-month study, both groups lost weight and improved their heart health, showing that losing weight may be as easy as filling up on more fiber.
The best diet for losing weight is Weight Watchers, according to the experts who rated the diets below for U.S. News. Volumetrics came in second, and Jenny Craig and the vegan diet were third on this overall weight loss ranking list, which takes into account short-term and long-term weight loss scores. Some other diets performed as well or better in our rankings for enabling fast weight loss, but long-term weight loss is more important for your health.