The thing is, we don't need to - I find it almost weird, though, when reading all sorts of things, which is a long held habit of mine, to realise that I eat fish bones without even thinking about it - not the spiky ones though, and I chew the bones after eating meat.
I read that the Inuit people get a good supply of Vitamin C by eating the skin of a sea creature which browses on algae.
From my own experiments, though, even my really battered and broken metabolism happily copes with some carbs every time I eat, so even if I eat eggs every morning I can vary what I eat with them - or go out and pick an apple from my trees and enjoy watching the morning for a while before cooking just eggs.
I would advise not eating lightly cooked offal which has not been frozen and defrosted beforehand, simply as a precaution against becoming a host for parasites.