- Overall microbial gut ecology is pretty stable over time — it takes a lot to change the bugs inside you
- Eating fiber has the biggest, fastest effect on the microbial profile
- What doesn’t change your microbes: sleep, exercise, mood (surprisingly)
- Saliva has little effect on gut bacteria (even though you swallow more than 1 liter of the stuff per day!)
and here's when one of the people got sick:
A little scary how permanently his gut bacteria were changed because of one sickness.
Very interesting experiment, and I look forward to being able to do the same thing on myself someday.