I'm not sure why your doctor has your husband on Ensure and Boost...I've had a PEG tube in since my surgery on Sept 11 and have been on a liquid diet ever since. My doctor put me on Nutren, made by Nestle and have rarely had anything other than an occasional loose bowel...also, our insurance pays for it and I've been able to keep my weight stablized...you might check into this with your doctor...everybody has different issues with this cancer thing, so your husband might have to use those products for some reason.