"eat anything that is white" that could go wrong is soooo many levels.
I thought by white, I thought it meant holy magic... but that is indeed a bit ridiculous, I'll eat clothes that are white, omfg Acnologia got scales that are white, he can eat that. EZWIN.
One question though, why can't Acnologia just Suck out all the "magic" that is within their body? Like Ethernano, which is the mandatory for all mages to ultilize.