That's interesting.The 16/8 is pretty standard, try bumping it up to an 18/6 (three medium meals 2.5 hours apart) or even a 20/4 (2 meals 3 hours apart). You can drink water or herbal powders throughout the fasted state but nothing that would spike your insulin levels, and no caloric content. The lifts, runs, and moods are a lot stronger when you're on the fast. Remember your essential vitamins, minerals, and nutrients, if you give your body everything it needs then you will not become hungry during the fasted states. When your body is not digesting food all the time the blood will be free to move around to your brain and your muscles, and you can busy them with learning and exercise, two things you must keep up at all costs.