Frequent and thorough hand washing with warm, soapy water is the best prevention against gastroenteritis, says LeeAnne Jackson, Ph.D., a health science policy adviser in the FDA's Center for Food Safety and Applied Nutrition. Travelers who don't have ready access to soap and water may want to carry along a hand gel sanitizer, found in most supermarkets and drugstores.
Jackson also advises travelers to choose foods and beverages carefully. Foods should be thoroughly cooked and served hot. Poor sanitation in some countries may lead to contaminated food and drink, which are the major sources of stomach or intestinal illness while traveling, according to the CDC. Just about any food can become contaminated if handled improperly, but items of particular concern include raw meat, raw seafood, green salads, and raw sprouts. "In some countries, it's wise to steer clear of street food vendors, especially if they serve fresh-cut fruits," says Jackson, who advocates purchasing fruits whole, peeling them and cutting them up yourself.
Travelers should avoid unpasteurized milk or products made with unpasteurized milk, unpasteurized juices and ciders, says Jackson. Beverages that may be safer than tap water in some countries are hot beverages, such as coffee or tea made with boiled water, canned or bottled carbonated beverages, and beer and wine. Avoid ice made with tap water. Water on the surface of a beverage can or bottle may be contaminated, so wipe clean and dry the area of the container that will touch your mouth.
