Lowering your body fat percentage means reducing your overall body fat. To lose one pound of fat, your body needs to burn 3,500 more calories than you consume—meaning to lose one pound of fat in a week, you need to reduce your caloric intake by 500 calories a day (or burn these calories through exercise), according to the U.S. Department of Agriculture (USDA). Lowering your body fat percentage will likely involve reducing the number of calories you eat along with increasing your physical activity level.