I don't have IBS (tho' I can't eat/drink a whole, long list of thigns that are acidic or strong on an empty stomach - like tea- without it simply bouncing back 20' later)... but Clif bars definitely, always give me stinky gas (tho' not *severe* - like Marge's great-tasting onion/garlic roasted veggies...) . If it's all there is at a rest stop for a long ride, I'll eat 'em but not happily.

I tend to be a free-flowing person, myself and have pondered wehther that's correlated to my free-flowing personality... I don't keep much inside in many different concrete and abstract ways :-)