Brother of my wife is ulcerative colitis. He always had a diarrhea and bloody stools. One day, he complained of abdominal distension. I've physical examination him for the first time. I recognized a lot of gas in his right lower and left lower abdomen (cecum and sigmoid colon). And he was always eating high FODMAP diet.
For this reason, I was induced him low FODMAP diet. As a result, his abdomen of gas is no longer at all. After one month, his diarrhea and bloody stool was disappearing.

This case is the evidence that ulcerative colitis is improved by low FODMAP diet.

Gibson et al. were described that ulcerative colitis and Crohn's disease may be improved by low FODMAP diet in 2005.

Gibson PR, Shepherd SJ. Personal view: food for thought--western lifestyle and susceptibility to Crohn's disease. The FODMAP hypothesis.

Aliment Pharmacol Ther 2005; 21: 1399-409.

I think, UC is occurred by over-fermentation in large intestine, and CU is occured by over-fermentation in ileo-cecal portion.

Namely, CU may be induced by IBS with SIBO.

UC may be induced by IBS without SIBO.

 This might be an extreme theory.
However, first time advocated. 

Please remember this theory.


 The truth is a very simple equation.

Too simple truth is hard to notice.