When it comes to dairy, you should never drink raw milk, no matter what the date says. This is because it hasn't been pasteurized to kill harmful germs like salmonella, E. coli, listeria, and campylobacter. Other dairy products can also go bad quickly after you open them. They have a lot of protein, which bacteria like to grow on. Katherine Zeratsky, R.D.N., a clinical dietician with Mayo Clinic, notes, “Milk products have a protein content that’s a good growing medium for bacterial action.” She also advises, “If they develop a sour smell, off color or curdling, you’ll obviously want to toss them.” Generally, once you open these kinds of milk products, it's best to use them up within about a week.

For individuals at high risk of food poisoning, such as children, older adults, pregnant wom

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