Though calorie control is a must, hormonal control is nearly as important. Coupled with calories, hormones govern fat-burning. Suppress fat-storing hormones and you can expect a significant amount of body fat to melt away. The ideal way to control these hormones is to keep your carbohydrate intake in check, since carbs kick up insulin, a hormone that inhibits fat breakdown and drives fat storage. Eat fewer carbs and insulin levels tend to moderate, leading to fat loss.
Carbs are always perceived as the enemy, but they too have a significant role in fat loss. The body needs glucose to work, and to a certain level, your brain requires it to think and function optimally. Some will argue that technically we don't need carbs, but many of your body's basic functions will decrease in performance without the right amount of carbs at the right times.
At its core, burning fat comes down to the process of lipolysis—the breaking down of fat lipids, explains Seedman. This happens in the mitochondria of the muscles, or the powerhouses of the cells, responsible for generating the energy our cells need to do their jobs. Exercise has been shown to improve mitochondria function, which then promotes fat breakdown, Seedman adds. Plus, working out helps regulate pretty much all the hormones that optimize fat loss.