Food Safety Expert Warns: “The Biggest Risk Is Wrapping Hot Food in Aluminum Foil”

“The biggest risk is wrapping hot food in aluminum foil” before it has cooled properly, food safety expert Vanessa Coffman warned in an analysis cited by Southern Living.

Aluminum foil itself is generally safe, she said, but it can slow the cooling process when hot food goes straight into the refrigerator. That can leave food for longer in the temperature danger zone, between 40°F and 140°F, or 4.4°C and 60°C, where bacteria multiply most quickly.

Coffman warned that leaving food at unsafe temperatures can have consequences beyond ordinary spoilage. Some bacteria produce toxins that reheating does not destroy. Leftovers should therefore be refrigerated within two hours of cooking.

She singled out potatoes for special attention because they naturally carry spores that cause botulism. Wrapping cooked potatoes in foil creates a low-oxygen environment, which can allow the spores to grow if the potatoes remain in the danger zone. Her recommendation is to remove the foil immediately after cooking and refrigerate the potatoes once they have cooled.

Acidic foods, including tomatoes and oranges, can also react with aluminum foil. Coffman said this generally affects the food’s flavor and represents a quality issue rather than a food-safety risk. The supplied article ends while introducing her further advice on storing food in foil.

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The biggest risk comes from wrapping hot food in aluminum foil before it has cooled adequately.