What we usually say about losing weight generally refers to the effect of losing weight by consuming fat. Losing weight belongs to a behavior pattern aimed at reducing excess fat and weight of human body. It means that a certain type of overweight and obese people use behavioral analysis to analyze the characteristics and exercise types of obese people, and on this basis, reasonably correct the actions that lead to obesity. When we lose weight, the order of energy consumption in human body energy is: sugar, fat and protein in blood. So losing weight is before losing muscle, so losing fat is better.