i don't think excreting right after you have consumed meal is good. A healthy body no mater how fast your metabolism is, cant absorb and dispense food that fast. Change your diet and see how your body deal with it. Also how long do you wait between you consume meals?
I doubt it's that he's excreting what he just ate... if he is then there's a problem and he'd weigh not much more than nothing. It's most likely he has a regular bowel with good fiber intake, and his bowel excretes the processed waste to make room for the incoming.
How come every time i eat chicken wings i shit my brains out the next morning???? every time i eat cereal for breakfast, i take a huge dump right afterward, if i don't eat breakfast, it doesn't happen. its your body making way for a new loaf like mentioned above. don't freat brother.
Maybe someone stole your small intestine. You fall asleep in a back alley in chinatown at some point? aranoid:
My ex would love that guy, especially if he just so happened to have long blonde hair. BITCH Oh um, carry on with the thread necromancy.
