Hi, Dan, I agree that sometimes the damage from CF may be too great in an adult to see vivid effects. But I think there may be more subtle effects, such as increased energy and stamina. Also, you may discover that you are able to remain at the same weight even during exacerbations, or able to fight viruses and flus more effectively. And there are some adults who have experienced some of the more vivid effects--one young lady was able to get off the lung transplant list because her PFTs increased so markedly. So keep going . . . I think there is more benefit there than perhaps we are able to easily see.