Is he taking any drugs like Salagen to help improve his saliva production? If not, I would ask about it. If he is on something, maybe they need to increase the dosage.

I didn't know Zinc helped improve taste, but I did start taking it a month after my treatmments to improve general healing. Has he been checked for thrush? What is the condition of his tongue? Does he brush it? If he has a lot of 'gunk' on his tongue, it makes it difficult to taste things. A tongue scrapper can also be used at this point.

While he may still need some Ensure to compliment what he can eat, he should be able to eating by now. Follow through on everyone else's suggestions.

Take care,
Eileen