https://www.cghjournal.org/article/S1542-3565(21)00911-3/fulltext?dgcid=raven_jbs_aip_email#relatedArticles

Interesting study:

Ultra-processed foods and risk of Crohn’s disease and ulcerative colitis: a
prospective cohort study
Chun-Han Lo, Neha Khandpur, Sinara Laurini Rossato, Paul Lochhead, Emily
W. Lopes, Kristin E. Burke, James M. Richter, Mingyang Song, Andres Victor
Ardisson Korat, Qi Sun, Teresa T. Fung, Hamed Khalili, Andrew T. Chan, Ashwin
N. Ananthakrishnan
PII: S1542-3565(21)00911-3
DOI: https://doi.org/10.1016/j.cgh.2021.08.031
Reference: YJCGH 58064
To appear in: Clinical Gastroenterology and Hepatology
Accepted Date: 23 August 2021

(payment required to access)

The surprising (to me) conclusion:

Consumption of ultra-processed foods was shown to correlate with increased risk of Crohn's Disease, but showed NO association with increased risk of Ulcerative Colitis.

Even though the authors note that components of ultra-processed foods (sweeteners, emulsifiers, etc.) have correlated to UC in lab models. But no statistical effect in the human population studied.