Funny story - our church participated in an all-day fast on Saturday, and our preacher's young son (about 7 years old or so) was NOT a fan.
I don't blame him. The whole fasting thing honestly escapes me. Not that I'm obsessive about food or anything - there are many times in life when having to eat is an inconvenience because I've got other stuff to do. But my stomach gets extremely pissed at me if I put off a meal by more than a few hours. I know other folks can survive fasts because all they get is grumpy and their tummies rumble and stuff. I get all acidy and light-headed and it just ain't a pretty picture. That wouldn't be much of a spiritual discipline for me.
NP: "Song for My Sons", Sara Groves