Hey I will back you up on the explaination, Polly.The colon is known to become more active after you eat, so for some people eating seems to trigger the colon to "move things along" a bit vigouously.Some people seem to have more of a problem with this at certain times. Either IBS is flared up for some other reason, or for some people larger meals cause more of a problem with this than smaller meals.If you have very severe diarrhea from an infection (the kind where you are in danger of getting dehydrated, not the normal IBS type diarrhea) you could get food to go through faster than usual through the stomach and small intestine, but usually what you poop out during a meal is from 1-6 meals ago.It takes several hours for stuff to reach the colon from the stomach, much less come out the other end. Unless you have been fasting for several days, or had several bouts of severe diarrhea, all the stuff you ate previously has to come out before the stuff you just ate did.K.