Why do tourist get ill from traveling in Asia?

Ipunkme

New member
I am from Asia, one thing I noticed is that many tourists who visit my country are always getting sick, mostly diarrhea. Most of them say, well.. the food isn't hygiene. But hey... I eat that food everyday, and I don't get sick. Why American and European get sick easily?

I searched and searched and couldn't find the answer on internet.
Please help...
PLease no very short answer. I need an explanation. My guess is theres something to do with immune system? but not sure
 
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