I haven't have surgery yet and I'm already having a sensitivity to refined sugar. I'm four months into my pre op nutritionist monitored diet. Today I had a piece of my son's birthday cake and it's killing my digestive system. I had one last Friday also and the same thing happened. I've been pretty good following my diet,but have just noticed on days I have problems. Anyone else notice this? Is this an indication that I will have bad dumping after surgery?

Not sure about the dumping after surgery. I believe that's a symptom that may occur from having the bypass procedure. I do know that your tolerance to certain food items will change as a result of the Pre op diet. I've completed my 6mo diet with a surgery date of 4/26. I use to love coffee, still do, but I can't take a sip now without getting sick. So after years of drinking coffee 6-7 days a week, sometimes 3 times a day, I'm done with it.