I don't have UC but I've taken an interest because my father died from it. I recommend you read or listen to this book:
"The Clever Gut Diet" by Michael Mosley. Invaluable information he's collected from current research. Michael Mosley is a BBC health reporter and is entertaining to listen to.
I'm doing his recommendations and they are working well. You may be unfamiliar with fermented foods but believe me, they are delicious. I'm eating Kimchi and Natto everyday now.
I don't know where you are from but if close to Minneapolis you can find Kimchi at Costco and Natto at United Noodles - 2015 E 24th St, Minneapolis, MN 55404

Good luck
PS
If you're interested in slightly more detailed information; I recommend this book: 'The Longevity Diet" by Valter Longo.
Both available at Google books, easy download.