For anyone who's interested in managing UC through dietary changes, gluten should definitely be eliminated or greatly reduced. Dr. Mercola even recommends avoiding gluten for non-IBDers. You'll see from this link that eliminating gluten is the FIRST STEP in his beginner nutrition plan: http://www.mercola.com/nutritionplan/beginner.htm
In my experience, when you eliminate gluten, you may not notice an immediate change unless you have celiac disease. If you don't have CD, but are sensitive to gluten, it may take a while for symptoms to gradually improve as the colon heals. And you also have to be aware of hidden sources of gluten so you know you're truly eliminating it.
For the most part, I just don't eat breads, crackers and pasta any more. This can have the happy side effect of weight reduction. I do occasionally eat gluten-free waffles or cookies, but I've found I actually feel my best on a completely grain-free diet. If you haven't already, check out the Specific Carbohydrate Diet for more info: http://www.scdiet.org/ Breads for the SCD are baked using nut flours - primarily almond flour - and are delicious. And they don't require the purchase of any special kitchen equipment.
For information on gluten/casein free diet: http://www.gfcfdiet.com/
Diagnosed with ulcerative colitis spring 1999.
Maintenance dose sulfasalazine. Probiotics, l-glutamine, vitamin D and fish oil caps. George's aloe vera juice. Oregano oil antibiotic, antiviral, antifungal. Mostly grain-free and dairy-free diet. Long-term remission with only minor blips.