Well I didn't know that about potatoes but I don't eat them because I use the Specific Carbohydrate diet which does not allow them for other reasons, because they are a starch and a carbohydrate which feed the "bad" bacteria in the gut.
Believe me I love potatoes but I love being in UC remission more.
In remission April 2010 after 10 years of suffering and no remission ever
Jan 2010 started SCD diet (modified to remove dairy, fruit & juices)
Bleeding stopped in 3 days, other symptoms improved slow & sure
Diet: Gluten/grain-free, fructose-free (blueberries OK), dairy free (swiss cheese OK), starch-free
I eat: Protein(meat/fish/eggs,no soy), nuts(soaked/roasted), non-starch veggies, nut-flour muffins
Daily: fish oil, Vit D3 2000 2Xday with oil/fat, veggie juice, sunflower seeds, probiotic VSL#3
Highly recommend: the book "Life without Bread" and the Specific Carbohydrate Diet