Hi to you and sorry you are flaring right now.
To answer your question...food seems to be so individualistic (as most things with this disease) that you are going to get many different answers.
For me personally, food does not matter to my UC. This does not mean I don't try to eat healthfully but keep in mind that food may or may not be hurting your symptoms.
When I am flaring I might not eat as many 'scratchy' foods, such as popcorn and I will try to eat more gut friendly, soft things.
You may have to experiment to see what you tolerate best. What works for one won't work for all.
Hope you feel better soon