How many microbes come into the human GI tract from outside sources (e.g., food)?
Other related questions:
- How many cells /day?
- How many are alive?
- How many kinds come in?
- How much flow through is there vs. digestion vs. colonization?
Note - I know there have been many studies of pathogens on food and how they get into the GI tract, but what about non pathogens?
Any references or #s would be very helpful.