Losing weight naturally means losing weight without medications or supplements for bariatric surgery. The core of weight loss is eating fewer calories than you burn. However, that’s not always as easy as it sounds. Find the support you need to maintain long-term natural weight loss… Exercise and physical activity is a key part of losing weight naturally – and keeping it off. Your body reacts to reducing your calorie intake by slowing your metabolism. You can counter this by increasing your metabolism through physical activity. Start slowly and gradually increase the intensity and duration.