Ben GreenfieldFounder, Ben Greenfield Life

Are “Poop Pills” The Ultimate Bowel Biohack Of The Future?

11 Apr 2026 · 2 min

Watch on YouTube

1:43

In this interview segment, Ben Greenfield asks about the risks and candidate suitability for fecal microbiota transplantation (FMT). The expert speaker emphasizes that FMT has an exceptionally high safety profile, having been performed on patients ranging from three‑year‑old children to octogenarians. The only absolute contraindication mentioned is a complete lack of an immune system, not merely low white‑cell counts. The discussion explains how gut‑associated lymphoid tissue interacts with the immune system, leading to reduced food reactivity and increased anti‑inflammatory compounds as the gut heals. A notable case report is highlighted where a patient with severe C. diff infection and celiac‑like gluten sensitivity underwent FMT, which resolved the C. diff infection and appeared to improve the gluten sensitivity, illustrating the broader therapeutic potential of microbiome restoration.

Chapters

The other thing I want to ask, and then I would love to kind of using me as a case example, point out some things that might change in the gut or symptomatically. Are there risks or are there people who come to you and you're just like, "No, you can't be a candidate for any reason?" Essentially, no.
And, this is the great thing about FMT is that the safety profile is just so high. It has the word transplant in it, and so you're thinking, "Well, this is a big procedure." I've treated kids as young as 3 and adults into their 80s. The only case where I would have some pause would be if someone literally had no immune system. And I don't mean like low white blood cell counts or something like that, but literally no immune system. And that can happen for some people in some diseases. As your gut heals and as the immune system that is, is like directly interplays with it, it's called the gut-associated lymphatic tissue. So as that lymphatic tissue that interplays with the immune system, as that becomes less reactive, so you become less reactive to the foods. And so gut healing, more anti-inflammatory compounds being produced. Now your immune system can calm down and not think that all of these foods are invaders and pathogens. And over time, that response should decrease. The only, you know, so there's been a really interesting case report where a patient actually had C. diff and they had a severe, you know, gluten sensitivity, but, but severe, you know, the celiac form. And they did FMT for C. diff. They resolved the C. diff.