2. Leafy Greens
This goes for pre-made or pre-packaged salads, bagged, and loose leafy greens. Even though many of these are prewashed multiple times, studies have shown that they still have a tendency to carry bacteria like E. coli, as they’re handled so frequently, says Levy. Always wash these prior to eating, and don’t eat past the date, or once they begin to get slimy—whichever comes first.