Radiation may have killed the natural flora in the digestive tract. Health food stores have pills to replenish the flora. Also some yogurts, like Activia claim to do the same. You might also try eating some very dark chocolate. I get the Lindt dark chocolate, which is over 60% cocoa. That seems to regulate my digestion pretty well. It firms things up, but doesn't cause constipation. And who doesn't like eating chocolate? :wink: