Obesity is a leading cause of many health complications across the world. Combined with diabetes and metabolic diseases this can be fatal if you do not lose weight fast. But losing weight is easier said than done. You may be following a strict diet and exercise regime. Yet it may be proving really difficult for you to lose weight. This may be due to the way your body burns fat. Your brown fat may decide how you burn off your excess fat. Not all body fat is bad fat. Your body has a certain type of fat called brown fat.