Check out the following books (in order from strictest to most lenient) for suggested diets for UC:
Breaking the Vicious Cycle
Listen to Your Gut
The New Eating Right for a Bad Gut
In general, IBDers seem to respond well to low carb diets, so a lot of potatoes and bananas may not be a good idea. Gluten and dairy are common offenders and some folks do well eliminating all types of grains.
Diagnosed with ulcerative colitis spring 1999.
Maintenance dose sulfasalazine.
Probiotics, l-glutamine and fish oil caps. George's aloe vera juice. Oregano oil antibiotic, antiviral, antifungal.