I know that Chris had many mouth changes. Beside the bulbar stuff we all know about.
He lost his ability to distinguish sweet and sour so well.
He also lost his tolerance to hot food (as in temperature).
He was previously a cafe owner who cooked all day long. He had very sensitive taste always judging did it need more this or that and could eat something made by another and know what was used to make it taste that way.
He also had what we called a 'cast iron' mouth - he could taste and eat things bubbling hot out of a pan. He always served up very hot food and I always had to be careful to cool mine well, but he would just eat on straight up. He lost that and things that were barely hot to me would nearly burn his mouth.