There's not such thing as fat bone

Some people do have naturally thicker bones, like the giant teddy bear by the name of Andre the giant

More like they already have. Poor bones...

I've got a tumblr, I could post this but it's off topic.

Don't know, but the fat person's pic is a different layer, I think more to the back, as you can't see their spine in their neck. That also explains why their brains look different