As a travel rule, originally laid out by Jodi Ettenberg of LegalNomads.com, you should only eat fruits that have a thick layer of skin that can be peeled away, such as bananas, oranges, or rambutans (if you happen to find yourself in Southeast Asia). That natural casing keeps the fruits fresh and clean, but you’d still be wise to wash the exteriors thoroughly before peeling, lest contaminants on the skins find their way onto the fruit itself. Fruits like berries, strawberries, and apples, on the other hand, should be avoided, because these fruits are exposed to bacteria from the water they are washed in, as well as the places where they are stored. And this probably goes without saying, but don’t pick and eat any berries you find yourself. We don’t care how purple and delicious they look.