User blog comment:LuffyPirateKing/Luffy and his belly/@comment-1595565-20121021173205/@comment-3213092-20121021224400

Well in this series people told a lot of stuff and then someone else proved them wrong.

For example in Mock Town people around the city believed and told the Straw Hats that there is no such thing as an island in the sky. They proved them wrong.

Thing's like that can change, as far as we know from the manga, people that 'eat' more than one devil fruit explode. This is a fact.

But it doesn't mean that there are no exceptions. Hell, Blackbeard found a way to restore more than one Devil Fruit into his body, even if he 'absorbed' it. It's still inside him.

So it's like normal people, if you 'digest' a second Devil Fruit you die. I don't think Gomu Gomu is a normal fruit. And Luffy's stomach is by far not normal..