From a health point of view, diet plus exercise is the most reliable way to lose weight. Fitness and fat reduction is a very healthy and good way to lose weight! The essence of losing weight is to make the energy you eat less than the energy you consume every day. There is a special term called energy gap, which is the gap between the energy you eat and the energy you need. The bigger the gap, the faster you lose weight. In order to ensure the energy gap, dieters need to diet and eat less food. The less you eat, the greater the possibility of losing weight. Therefore, dieters need to diet. But dieting is not endless, and excessive dieting will affect your health. Another way to ensure the energy gap is to increase energy consumption, and the best way to increase energy consumption is exercise. Therefore, exercise can also lose weight.