With the possible exceptions of major cities in developed nations: Do not eat raw vegetables or salads.
Do not drink water or milk that is not pasteurized or bottled. Eat only fruits that you have peeled (bananas, oranges). Do not eat foods sold by street vendors or uncooked foods like sushi. Eat food which is fully cooked or boiled.
**This is not to say the foods offered are in themselves dangerous; just that they may introduce bacteria that is strange to your system, thereby causing illness.**
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