I went keto several years ago and eventually became mainly a carnivore a couple of years ago. I didn't have IBS or Crohns but I had plenty of other problems. They all went away when I stopped eating sugar, grains, and starch vegetables. I honestly have never felt healthier. I only eat once a day also. I don't get hungry. I have heard from several people who say they have gotten rid of their digestion problems by eliminating sugar. I also got rid of my depression, anxiety and sleeping problems. Give it a try. You will feel a little sick for the first week or two, but after your body adjusts you will feel awesome. My joints even healed up. Stop eating all the manufactured factory oils also. Use only Olive oil, butter, bacon grease, avocado oil, or coconut oil. Try to eat nothing manufactured. Except sweeteners like allulose. Good luck