Exercise on an empty stomach may cause hypoglycemia, which is quite dangerous in severe cases. Normal diet. If you want to lose fat, change your eating habits, eat less oil and salt, eat more fruits and vegetables, increase the proportion of protein, eat less carbohydrates and choose coarse grains as the staple food. Increase aerobic exercise time. It is certain that you will lose some muscles when you lose fat, but you can gain muscles later. It's okay. Moreover, if you have a large proportion of muscles, you will consume more calories than others when you lose fat. After anaerobic exercise, protein can be supplemented in time. If it is too late, you can choose protein powder. It should be no problem. If you are satisfied, adopt it ~