Robin, I can identify with your dad. I was one of those people phrannie mentioned, think it was 5 or 6 months until I could tolerate anything thicker than a shake. But he will improve. Until then, those nutritional drinks will keep him alive. I'm suggest not rushing the process until he's ready. And when he is, let him tell you what he's interested in eating. He can continue the VHC until he starts adding enough solids to maintain good nutrition.

Dunno if you've been mixing other stuff in with the Boost, but there's plenty of nutritious items that can share a blender - peanut butter, fruit, yogurt, etc., etc.

Good luck and keep us posted.