I remember the day I started my bicycle ride at the 15 hour fasting time (it had been 15 hours since my last food). I took snacks with me just in case. I said to myself, “I’ll go as far as I can and if I feel like I need to stop or eat, I will”. I ended up bicycling for 20 miles with only drinking water (lots of water, actually). And my time was only 3 minutes slower than the previous ride, while fed. After I got back I rested and showered and still didn’t eat for another 90 minutes. I just biked for 20 miles completely fasted , went for almost 18 hours without food, and I didn’t die. In fact, other than being tired, I was okay. Not hypoglycemic. No shaking. Not panicked. Not half dead. This was a major turning point in my life. It illustrated that I was far too worried about hypoglycemia or " starving". And what I used to think of as panic eating was merely a psychological drive. I can now better differentiate between psychological hunger and true physiological hunger. Now when I go too long without food I just get tired and slow down. I don’t panic nearly as easily. Back when I was losing the weight I could fast for 20 hours before needing to eat, all while doing my normal activities. Now a days, I’m too slim so I don’t go as far. I guess I can, but if I fast for too long then I slow down and become non productive and it’s not necessary for me to fast that long anymore. 16 hours is all I need these days.