Eating "excessive" red meat seems very likely cause high iron concentrations in your lower intestines. Beyond that - YMMV.
Looking at Inuit and Mongolian populations for stuff like this would likely be a good approach to actually learn stuff. Almost a strictly meat diet, but without all the confounding variables of sedentary office workers, industrial chemicals, and highly processed foods with tons of sugar.
In all likelihood, Inuit microbiota is very far from Western one, at least as long as they don't adapt Western diet.
I have Lynch syndrome: a hereditary cell mutation which increases risk of colon cancer. Patients like me get a colonoscopy every eighteen months or so only to remove polyps. For a decade I had not had a single polyp to remove.
Then in 2022, I got another cancer which gave me blood deficiency (low hemoglobin levels), and just to keep myself alive I took strong iron supplements for months. It did of course also stress my immune system. I got colon cancer in record time, which surprised also my doctors. It grew from no visible polyp (my last colonoscopy) to two inches in nine months, and in-between that I had an X-ray that also showed nothing (but which can't detect tumors small enough).
https://www.lodgecastiron.com/cleaning-and-care/cast-iron/sc...