I eat sweet potatoes occasionally. White potatoes - I dunno, I don't have a good position... Just a rough idea that anything that starchy might as well be bread or sugar and I've already decided to avoid those. It might be one of those things I do where I have a rule just for the sake of keeping the rule in order to build discipline. I'm profoundly undisciplined at times in other areas of life, so I figure if I can adhere to a few arbitrary rules here and there maybe it'll help in general. Perhaps I'm just nuts!