He also has started mixing all of his food together until it looks like baby food. He says he has problems chewing but chews some foods fine. He is also using more salt and always insists on never leaving anything on his plate, rather he is really hungry or not. He actually says that he never gets hungry.
Many people your uncle's age have trouble chewing, managing, and swallowing food. Sometimes the teeth are very worn, so things like steak or corn on the cob can be a huge challenge. Foods like cornbread can cause them to choke. Your uncle has found a way he can manage the food best, so I would let him do what he needs to do to make it palatable.
Take care,
Carol