I've never done any kind of fasting well. Doesn't matter if it's medical or spiritual, I go more than two or three hours without eating and my body starts complaining. Which is probably why I have such a ridiculously hard time losing weight. (That, and I'm a little lackadaisical about the whole thing. Now that I'm having trouble fitting into most of my pants I may, possibly, actually put in an effort.)
I'm not sure if Dad realizes how close I was to gnawing on his arm (or the arm of my chair) while waiting for surgery.