Can I see if user edited the inside of a document?

Hi,

I was wondering, is it possible to get the information that a user has edited the inside of a document? Not metadata, I don't care about metadata, I only want to see if the user has edited the document or not.

Any solution including VBS would be appreciated.
I'm thinking that reading the document size in bytes could be a solution (comparison between version x and version x+1 byte size), but not sure.

Thank you!

Dominik