For those who can't have gluten: it is not so very difficult to make a sourdough starter with gluten free flours, and I think it is really worth it for the flavour and disgestibility of some of these grains. I've just started one recently with brown rice and buckwheat flours, and some potato cooking water....and it is bubbling and doubling and doing all of that great sourdough stuff! Have used the "discard" to make pancakes, crackers and a focaccia bread so far....it's sourness is still young and I"m hoping it will get more complex, sour, and generally fantastic as it grows along.
I did try sourdough with 100% organic rye flour, to test if my gluten intolerance could be bypassed by the fermenting....but it only took two days of eating that delicious, fantastic bread for all of my gluten-sensitive symptoms to return, unfortunately.