This is what's known as insulin resistance. Basically, when your body doesn't respond well to insulin, it actually makes more of the stuff, according to the National Institute of Diabetes and Digestive and Kidney Diseases. And that can lead to fat storage, especially around the middle of your body. That's where protein comes into play: A diet high in protein may protect you against insulin resistance, says Aronne.
Core exercises will strengthen your abs, but they won’t eliminate the fat that lies beneath them. To do that, you have to ramp up your overall calorie burn with cardio (running, walking, biking). A Duke University study found that people who did moderate cardio for 178 minutes per week (roughly 30 minutes of walking six days per week) gained hardly any visceral fat over the course of eight months. Participants who worked out at a higher intensity (jogging) for a similar amount of time saw even better results — reducing their belly fat by almost 7 percent. To maximize your workout, try interval training, which alternates between high- and low-intensity cardio.
Packaged foods, partially hydrogenated oils and enriched flours are not your friends. Above all, remember this one word: transfats. Avoid it at all costs. Researchers have found that the transfats found in margarine, packaged cookies, crackers and pasta increase fat in your midsection, and can actually redistribute fat from other parts of the body to the belly. For more flat-belly foods, click here.