An August 2019 study by UConn Health and Texas A&M University found that walnuts may give some protection, saying,
“We are continuing our work to understand whether those metabolic changes are part of the protection … We are not suggesting that people with ulcerative colitis be maintained on a large walnut diet between active flares. But, we are hoping that we'll be able to determine the active compounds - nutrients, phytochemicals - in walnuts that cause protection."