In seriousness, there was an adjustment period of "intestinal irregularity" when I first switched, presumably due intestinal flora etc. adapting from substantial amounts of carbs and fiber to all fats and protein. These days I'd say I'm on the infrequent end of normal, pooping once every day or two, which I think is pretty typical for paleo folks.

If I do end up eating a substantial amount of carbs, usually at a restaurant or dinner party, it does often give me the runs later, which is my primary reason for strictly avoiding grains moreso than health or philosopical concerns. And if I drink too much (which is easy to do when you eat low-carb) all bets are off.