First things first: your stomach is made up of good and bad bacteria, which scientists like to call microbiota or gut flora. And it's important that you keep it in check, as if you were keeping a seesaw level. "Microbiota is considered the body's garden, and it has a controlling influence over a lot of important bodily functions, including metabolism," says Gerry Mullin, M.D., author of The Gut Balance Revolution. Studies show that a diet full of fat and refined carbs (think white bread and potatoes) and low in fiber (fruit, vegetables, beans and oats) disrupt the balance, and the seesaw starts to tip in favor of weight retention and fat accumulation.
Though this diet will help you drop weight and quickly, all while eating ice cream and sticking to a cheap budget, the fact that you're taking in fewer calories than you're burning in a day means that, eventually, you'll burn out. A healthy lifestyle requires eating nutritious foods and exercising. A diet with this low caloric intake doesn't provide your body with enough energy to burn if you're looking to make working out or simply getting more active a part of your daily routine.