Potatos never bother me. Peeled potato that is - potato skin seems to make things hurt on the "way through". I usually have my potato mashed with salt and a little bit of milk during a flare rather then baked. And they are full of starch and carbs. YUM!
Though I stay as far away from deep fried chips etc as I can - bad bad bad for me - potatos become bad for me as soon as they're dipped in boiling oil it seems.
Potato mashed with salt, a little milk and lemon juice, topped with a nice piece of grilled fish (or chicken)