For most people, winter is the easiest season to gain weight and summer is the easiest season to lose weight. From the point of view of metabolism, the activity of enzymes in human cells is the most active at 37 degrees Celsius. However, when the surrounding temperature drops and the body surface becomes cold, the metabolic activity in the body will also decrease, making it more difficult to burn subcutaneous fat. From the perspective of diet, cold weather will increase food intake, while hot weather will naturally reduce appetite. In summer, you can adjust and control your diet more, so it is easier to lose weight in summer.