Kerry,
My husband was much like yours going into the treatment. He is 6'2" and pre-diagnosis weight was something around 148. At 3 years post treatment, he is now at 142.

Is your husband being monitored by a dietician? For these skinny guys, it is especially important. Also, there are may liquid foods for the feeding tube that can be explored. I know that just after treatment the dietician moved my husband on to a product that had pre-digested proteins because it was determined that his treatment-traumatized body could no longer break down complex proteins.

The taste stuff will go away over time. The important thing right now is for him to get adequate nutrition in whatever way works.

We're all pulling for you,
Anita