When you say you "feel constipated" do you mean you have feelings of incomplete evacuation, pain, bloating, heaviness, etc? regardless of passing an acceptable amount of stool every day?These are part of IBS, and you may not necessarily be constipated, but that doesn't mean you don't have a legitimate complaint to your doctor.LiIke Terence says, clearing everything from the colon every day is really helpful for us, because our colons are really sensitive and spasm a lot. Most non-IBS people seem to do fine with as much as 3 days worth of food in there (or 72 hour transit time from mouth to anus). I can't imagine being able to tolerate that much in my colon at any one time. Dana