I’ve read that there is a lot of evidence that gut health is closely related to heart health, dental health, cancer and many other illnesses. Here’s an Interesting article on PCF.org, talking about
work being done on the Microbiome (health of and good/bad bacteria in your gut) and prostate cancer treatment, including immunotherapy...https://www.pcf.org/news/crystal-ball-for-predicting-cancer-treatment-response-your-poop/
Boosting the immune system: The epithelial barrier, the thin lining of the intestinal wall, is a virtual Checkpoint Charlie for immune system activity. This is a gateway with “a massive amount of immune cells on one side, and bacteria on the other side,” Sfanos notes. “Several studies have shown that certain species of bacteria are overrepresented in the gastrointestinal tract of people who respond to immunotherapy.” One research group has focused in on a group of bacteria called Ruminococcaceae, and another is studying a microbe called Akkermansia muciniphila. Either of these, or both, may turn out to be very important. “The idea is that if, for whatever reason, the presence of these microbes is essential to generate a response to immunotherapy, you would want to introduce these bacteria,” in a fecal transplant or perhaps in the form of a targeted prebiotic or probiotic.