Been doing my best to avoid it. No whey, no cheese, no chocolate never milk or cream but about once in week I fuck up with something without thinking like a packaged food or something that says "may contain". There hasn't been much change in the stuffiness or the breathing and sometimes it acts up even more, so not sure if that is a loosening of phlem or what. I'm gonna give it some more time and see. I haven't taken butter out yet but I don't use it much except for some cooking,