Working out at a low intensity, 60 percent of the calories burned will come from fat. Whereas, working out at a high intensity only 35 percent of the calories burned will come from fat. However, the total amount of calories will be more at a higher intensity than low intensity; therefore, working out at a higher intensity will burn more calories from fat.
Low intensity workouts can still burn the same amount of calories as high intensity workouts but the low intensity workout will have to be done for a longer period of time.
Keep in mind that the best type of workout proven to produce the greatest health benefits overall is high intensity interval training.