I think it varies with everyone who has IBS, and for me, it varies with the trigger, the amount, and sometimes it takes a combination of factors to set things off. With the help of all of these good people, I've learned A LOT about foods that can set things off: stuff I never would have guessed can be a problem, CAN BE. My strategy is to eat more safe foods and minimize trigger foods while walking the fine line of insoluble fiber, and I have been doing really well lately!!