User blog comment:SolZen321/Could Godzilla actually exist/@comment-7622429-20140512024531/@comment-7622429-20140515143137

What I meant by self-generating is that his internal organ systems work like an EXTREMELY efficient nuclear power plant. Once you put in the starting materials, the rest is automated. Just gotta watch heat levels and all. A top-off is rarely needed for a long time. Several thousands of years in fact, for the likes of Godzilla.

And just because you don't NEED to eat food doesn't you don't eat it AT ALL. He's still an animal. Animals eat out of instinct. He won't actually need to eat, but he still thinks it's necessary every once in awhile.