UserThenLotsOfNumbers, there sure is an anti-inflammatory diet recommendation for UC! It's not the one that you see which eliminates lots of food groups but richer in whole fruits and vegetables, whole grains, legumes, and lean protein. These foods contain nutrients believed to combat the inflammatory process.
So you would need to include omega 3 fats, richly coloured fruit and vegetables, have a probiotic, include quercetins (in onions, apples, blueberries, cherries, broccoli, spinach, kale) and vitamin d. You would need to reduce triggers like processed foods and sugar.
The only problem with UC is you need to adapt around your symptoms, as you would imagine, so would need to be tinkered with to individualise.
Oh, yes and this is absolutely general information. Any specific information or plans for ANYONE would need to include a full assessment of medical history and meds, symptoms etc etc - just want to make that clear.