Barb - My son used Boost but had the same reaction after a few cans of it. His tastes changed all the time so I learned not to buy too many cans of anything. After Boost, we went to using Ensure which worked for a little while and also the Carnation VHC (which has more calories). Another thing that seemed to help was to dilute whatever he was drinking with water. He also went from chocolate to strawberry to vanilla milkshakes in the blender - said the chocolate tasted funny. He also took a liking to different flavors of sports drinks. I think it's just a matter of trying different things. I'm sure others will have some good ideas.