I'll suggest rectal meds as part of your med regimen. That might help you not believe so much that its the coffee, the sugar, the frozen fruit bars...etc.
Not to say that you won't feel good while having some of the above you've listed, but they won't be the cause of your flare...try not to confuse the two. Of course...that's my camp of thought...others will disagree.
My statement to that is...yes, you'll have food symptoms, but don't confuse it with your UC symptoms. Everyone has food symptoms when something doesn't agree. You'll drive yourself crazy believing that everything you put in your mouth is bad for you.
and yes....I've been there, done that bigtime. But that was before diagnosis and a short time afterward. There are probably many foods I don't eat, would never eat and do eat. Some cause me severe discomfort, some a tad, some not at all.
If you do have some UC symptoms or nice simmering inflammation, it's easy to ignore them since they are an improvement from more obvious symptoms. But, eating/digestion can disagree or cause more extreme focus. The belief becomes the food and not treating the inflammation. If after treating the inflammation (and some symptoms improve) and after eating certain foods, one has discomfort...then don't eat the food. But at least the inflammation is being dealt with.
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