Gundam Wing Notes #3 : Obsessive Eating Habits.
Yes, that's right. I'm talking about Duo Maxwell. If you guessed this was going to be about him, you get a cookie. Enjoy.
Duo is, indeed, a very odd case when it comes to eating. Though he consumes vast amounts of food in startlingly short amounts of time, he still remains one of the thinnest Gundam pilots (okay, they're all thin).
The source of Duo's particular eating habits is unknown, but the best guess is that he developed the habit to eat anything and everything he could get his hands on as a war orphan, and now that he has plenty to eat, gobbles too much. The world may never know.