Children's book about a man that turns into a giant monster

When I was a kid I was read a book about a man turning into a giant monster. The art was stylized, the characters were blue, but the monster was green. I believe the backgrounds were mostly if not all white with art on top of it.

From what I remember the story was about a man turning into a giant monster, via eating stuff. Getting bigger and bigger until he goes on a rampage. I don't remember exactly how the story ends, though my guess is that he is either goes back to normal or gets defeated.

I was read this book during the early 2000's, so it is either from that time or earlier. I also live in West Virginia, USA if that helps any.

I remember being freaked out by it and not wanting to read it anymore, but when I went to look for it years later I couldn't find it. It isn't something that an adult would be scared of but as a kid it was very different from the other books I had been read.

I am almost positive it is a little golden book, but I can't say 100% for sure. I tried googling different things but nothing came up.

Just curious if anyone happens to know anything, if so it would ease my curiosity on what freaked me out all those years ago.