Controlling diet is one of the keys to losing weight, because controlling diet means controlling calories, and calories are the key to losing weight. If you want to be thin, you must know what the essence of losing weight is. Calorie difference is the key word of thinness. Simply put, the real way to lose weight on the market now must be to make your diet have a calorie difference. The essence of losing weight is that the body consumes more calories than the body takes in.