It did touch on other things, mentioning that the increase of Crohn's being correlated to a new process of industrialized bread production.
Specifically, the continuous production of bread using a special yeast developed in Sweden. Apparently, the lack of rise/proof time doesn't lend itself to letting the yeast metabolize stuff linked to Crohn's, compared with the age-old batch production method.
FWIW.
Interesting.
It was pretty funny when he was first diagnosed. My wife is into healthy foods. teas, tinctures etc.
When the doctor said no whole wheat, no seeds, no fruit, no vegetables etc, she just about choked.