You didn't sweat when running, except for external factors, which shows that your physique has improved and adapted to the current state of exercise. You can extend the exercise time again, and it is best not to increase the running speed. Prevent anaerobic training, resulting in fat can not play a direct role.
Tip: Sweating is also a way of human calorie consumption. Sweat consumption per 2g 1 kcal. Sweating is not effective in losing weight, especially in summer, and sometimes hypertonic dehydration occurs. According to your information, you are in good shape now, so there is no need to worry.
Hebei institute of physical education sports medicine teaching and research department