Actually, as I understand it that is not at all how it works. In a healthy individual, the person eats IF and that moves the bowels within the next half an hour or so, depending on the individual. The BM is caused by the fibre (e.g. the fruit) even though the waste matter passed is not the fruit itself, as that needs to be digested and you have only just eaten it, but the BM is absolutely caused by the peristaltic movement unleashed by food eaten now. Back in the day when I was IBS-free I found that whenever I ate food with a high-IF content, ie fruits or wholemeal bread, I would need the loo within the next half an hour. (would have a beautiful bowel movement, no bloating, no pain. oh those were the days...)
Regarding definitions and all that, I always think of IBS as a condition when IF has too great an impact on your bowels either causing the digestive tract to seize up (C) or moving it immediately and too vigorously (D). (or it can be A) And there's bloating and spasms and all that.
-------------------- Susie, born in 1985,
(pseudo-)D and bloating April 2007-December 2010, now stable