No offense, but anecdotal evidence is not proof.
“No offense, but anecdotal evidence is not proof.”
4 trips, two people = over 180 meals and snacks. That is statistics and not anecdotal. A few meals is anecdotal.
I suspect that not eating where the tourists were and ate is the reason that I did not get ill. If you make the locals ill they will not come back to your place and eat again.