Lose It! This two-week phase is designed to jump-start your weight loss, so you may lose up to 6 to 10 pounds (2.7 to 4.5 kilograms) in a safe and healthy way. In this phase, you focus on lifestyle habits that are associated with weight. You learn how to add five healthy habits, break five unhealthy habits and adopt another five bonus healthy habits. This phase can help you see some quick results — a psychological boost — and start practicing important habits that you'll carry into the next phase of the diet.

Hormones are central to obesity as is everything about human metabolism, including body weight. A critical physiological variable such as body fatness is not left up to the vagaries of daily caloric intake and exercise. If early humans were too fat, they could not easily run and catch prey and would be more easily caught themselves. If they were too skinny, they would not be able to survive the lean times. Body fatness is a critical determinant of species survival.

We pulled the top 14 of the best commercial diets (marketed to the public for profit) and the top 12 of the best diets overall. We also threw five of the most popular diet apps into the mix. Since these are largely tracking devices that don’t espouse unique eating habits, they don’t appear to meet US News’ definition of diet, but are still potentially effective weight loss tools.
Diet is a major part of the equation, but you can also lower your belly fat with a strategic workout plan. Since you can’t reduce fat in one area, you’ll have to focus on a full-body burn. The good news? That means you’ll be trim and lean all over, not just your mid-section. To torch fat, holistic nutritionist and certified personal trainer Ashley Walter recommends weight training and fasted exercise.
For more support and resources, check out NuMi, a digital product for do-it-yourself dieters that integrates with wearable fitness devices and health platforms, such as the Fitbit and Apple Health. Nutrisystem also runs a website called The Leaf, which provides recipes, tips on jazzing up Nutrisystem meals, fitness tips and more. Counselors are available by phone, chat or via NuMi from 7 a.m. to midnight, seven days a week. Those same counselors (plus Numi) can help you wean off the program once you’re ready by giving your tips on how to get back in the kitchen and in front of the stove without sabotaging your weight loss.
"Protein is great for fat loss. It helps build and preserve lean muscle tissue and can increase the amount of calories you burn. It’s also a great source of energy that helps you feel fuller for longer, so you’re less tempted to snack. Good sources include chicken breast, tuna, eggs, milk and chickpeas. And if you’re finding it difficult to avoid snacks that are high in carbohydrates, try substituting them for protein shakes or bars. Remember also to opt for the lean sources of protein because some sources can be high in saturated fat."
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