My hubby isn’t T2 but has colloid colitis & IBS for which the dietary advice is very similar to ulcerative colitis, he eats a low carb diet of about 80 - 100 g carbs per day, he avoids red meats as that seems to irritate him but he eats, chicken, fish, turkey, he eats veg in moderation as long as it’s peeled, look at the veg on a FODMAP diet there are plenty of lower carb options that you may be able to eat. He avoids cauliflower & broccoli. He should avoid alcohol but he doesn’t - he’s not a big drinker but does have the odd glass of wine or a whisky - no beers though
he doesn’t eat fatty meats but does eat the skin on chicken he has butter, avocado, olive oil, he doesn’t eat much bread at all or pasta, he has a very small portion of rice now and then. He has full fat Greek yogurt and hard cheeses. He drinks plenty of water but too much coffee!
I have diverticula disease which is also recommended a similar diet and I do full keto with fatty meats etc and I’ve not had a flare up in 10 years, it’s been the best diet for me both for my T2 and my diverticula disease