User blog comment:LuffyPirateKing/Luffy and his belly/@comment-1595565-20121021173205/@comment-3213092-20121021192328

Well Luffy's stomach, thanks to Gomu Gomu is not normal.. As he can eat tons of food in a second, or when in Alabasta he filled his stomach with water to fight Crocodile.. It's just abnormal.

And about Teach maybe he absorbed yea, but thats a way of 'eating' a Devil Fruit. A person can actually have more than one Devil Fruit, in his own way. If a normal person eats two devil fruits he will explode, but I'm talking about Gomu Gomu here.