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Here’s Why You Should Never Wrap Your Leftovers in Foil

Reader's Digest logo Reader's Digest 1/2/2020 Ashley Lewis
a cut in half sandwich sitting on top of a table © DannyLerner/Shutterstock

Refrigerated leftovers typically last up to four days if your leftovers are sealed and stored correctly. For most people, covering a plate with foil and tossing it in the fridge is a quick, easy way to store food. However, wrapping your food in a sheet of aluminum foil is also an easy way to put yourself at risk for health hazards.

Much like we need air to breathe, bacteria need air to thrive. Some bacteria like staph and Bacillus cereus, which cause foodborne illnesses, produce toxins that aren’t destroyed by high cooking temperatures. When a hot meal is left out at room temperature for more than two hours, the bacteria grow rapidly, according to the Washington State Department of Health.

Using aluminum foil to cover food poses the same risk, since it doesn't completely seal your food off from the air. “When air is present, that allows the bacteria to grow faster, so you really want to get the right containers and pack things appropriately,” says Lindsay Malone, a registered dietitian at the Cleveland Clinic. “Otherwise, your food isn’t going to last.”

Malone’s golden rule for packing leftovers is to always seal them in shallow, air-tight containers to speed up the cooling process and keep bacteria off of your food. And make sure you put the food away in the fridge within two hours before the bacteria has time to wreak havoc all over the home-cooked meal that you spent hours preparing and cooking. Dairy and meat products are especially prone to bacteria growth, which reiterates just how important it is to use air-tight containers for any and all leftovers. Also, make sure to throw away any food that has been sitting out longer that. These are the 20 foods you should never put in the refrigerator.

“If you have an abundance of food left over, the smartest thing to do would be to put a portion of it in the refrigerator, and then pack a portion of it really nice in air-tight containers, and put it into the freezer,” says Malone. “And then when you’re ready to eat it, take it out.” Next, here are 15 more food storage guidelines you didn't know.

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