I did not change my diet. I know that certain things affect everyone's bowel movements differently. I had initially been prescribed a 4 tab regiment of Lialda. In 2010 Lialda suspended my colitis very effectively. I remained on a regiment ranging from 4 to 2 tabs for the next 5 years.
I had a UC recurrence in 2015. The colitis came on after an endoscopy (was prescribed Prilosec post endoscopy procedure,) and a colonoscopy, both of which were preformed in an attempt to determine a reason for recent IRON loss. Unfortunately Lialda did not clear it up as readily. BUT... I was diagnosed with C-DIFF which Lialda is not going to fix... so we can not blame it for not working last year. We can blame the scope, hospital or Prilosec...
After that bout cleared up, my Dr. has taken me off of the Lialda and suggests that I only take it if I get a recurrence.
As stated at the start, my diet is the same. That may not be the same or work for everyone, but when my UC is at bay, I have not had to change what I eat (Taco Bell Included.)