There have been reports of YouTubers I watch getting sick after eating food in third world countries. However, these countries are also home to a large number of people who do not get sick from eating the same food. I think this suggests that the locals may have developed stronger immune systems. What do you think?
When I travel abroad I try to drink bottled water from my home country for the first three days, after that I I drink the native stuff. A frequent traveler taught me this trick and it seems (yes I know anecdotal) to work.
Really not an expert on this stuff but I imagine there are just different bacteria in the water and that is what people are reacting to.