Whenever I thought of something delicious, my mantra was: "I have the rest of my life to eat! Now is the time to fast!"
Also: "I refuse to make it through the hardest three days only to buckle on the fourth or fifth!"
Trust me, the hunger diminishes considerably by the fourth. If not the fourth, then the fifth. I'm probably a fast oxidizer (according to G. Cousens) so fasting doesn't come easy. Well...by the fifth through tenth day, it WAS pretty easy. If I can do it, ANYONE can!