Hi Elaine, the first thing that I can think of is that Boost has lots of other artificial ingredients in it that could be irritating to your system. I recently found an app to put on my phone that is very comprehensive about foods and food additives to avoid. I've been off of dairy and gluten and yet I learned that there were numerous additives to some of the "approved" foods that I was still eating. You might want to have a look at it, it's called "Gluten Free Diet." I hope this helps.

Hi Beanglow, manufacturers are putting stuff in our food we know nothing about. They hire large expensive lobby groups for protection and put crap in our food that is killing us.We have no idea that they are doing this. READ THE INGREDIENTS! If it's something you don't know - Skip it and move on to pure and simple ingredients. It's important. We are slowly being killed by our diet. They put all kinds of stuff in our food like the pink crap they fill ground beef at Wal-Mart. A worker at Wal-Mart told me that one. We can't trust most manufacturers. Everybody wants us sick. That way the Pharma Companies make more money . Don't even get me started. Our government is corrupt and we are suffering because of it.