I too have to eat MASSIVE amounts of food to maintain my bodyweight. I'm 6'0" 155 now... I've dropped about 10 pounds this year. I eat, and eat, and eat until I'm sick, and have still managed to shed 10 pounds. Better this than the opposite, I guess.
Oh yeah, I'm 28 years old. A metabolism like mine is understandable in high school, but I'm no pup anymore.
Additionally, I sit in an office all day and eat like s**t. Doughnuts for breakfast. Frozen pasta boxes or leftovers for lunch. And massive servings of whatever the wifey cooks for dinner.