I'm currently in a "mini" fast. I finished dinner last night at 6:30 PM and then had a protein shake after working out at 8:00 PM. Aside from coffee and water, I haven't eating anything this morning (so about 16 hour fast now). What I noticed is that around 8:30 AM, my stomach was screaming at me to eat something. After drinking more water/coffee, it got better. I'm going to eat lunch in 30 minutes or so but I could definitely go all afternoon with no food. This fasting stuff isn't that difficult and I'm sure gets easier if you are doing it everyday (16/8) or a longer one every couple weeks.