10 foods that you shouldn’t reheat in a microwave

Some 30 years ago, American kitchens received the gift of the microwave and quickly became dependent on it for lightning-fast heating. Younger generations can’t even imagine making oatmeal, hot chocolate, or popcorn without it. And yet so many of us are using the microwave incorrectly for reheated foods. Sure, we know to never zap aluminum foil, metal, or plastic, but there are equally dangerous risks involved in nuking certain foods.

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Foods to never reheat in a microwave
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Foods to never reheat in a microwave

10. Potatoes

Thankfully, you’re still safe to nuke a raw spud for a quick and easy side dish. The danger comes when you try reheating cooked potatoes. Cooking potatoes in aluminum foil protects the bacteria C. botulinum from the heat, meaning it can still thrive if the potato stays at room temperature too long, and potentially cause botulism. Popping that contaminated tot in the microwave won’t kill the bacteria, either, so play it safe by cooking them on a baking sheet instead of wrapped in foil and refrigerating leftover potatoes as soon as possible. Stick with these foods even professional chefs cook in the microwave instead.

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9. Fruit

Microwaved grapes won’t make raisins, but they will make plasma, which is a form of matter that’s created when gas is ionized and lets electricity flow. In a video, Stephen Bosi, PhD, physics lecturer at the University of New England, shows nuking two pieces of a plain ol’ grape in a microwave can create enough plasma to melt a hole through a plastic container. Plasma might not be produced from other fruits, but you could still be left with a mess. Whole fruit traps steam under the flesh, meaning it could burst while it’s heating.

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8. Hot peppers

When hot peppers are reheated in the microwave, capsaicin—the chemical that gives them their spicy flavor—is released into the air. Airborne, the chemical can burn your eyes and throat. In fact, one Rochester, New York, apartment building was evacuated after a microwaved pepper caused residents to start coughing and have trouble breathing. Don’t miss these other 18 ways you’ve been using your microwave wrong.

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7. Beets

The same chemical conversion that happens to spinach holds true for reheating nitrate-rich beets and turnips! Good thing they’re just as delicious cold. On the flip side, here are 16 foods you never knew you could microwave.

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6. Leafy greens

If you want to save your celery, kale, or spinach to eat later as leftovers, plan to reheat them in a conventional oven rather than a microwave. When blasted in the microwave, naturally occurring nitrates (which are very good for you on their own) may convert to nitrosamines, which can be carcinogenicstudies show.

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5. Chicken

The most important thing to realize about microwaves is that their heat does not always kill bacteria, because microwaves heat from the outside in instead of the inside out. As such, certain bacteria-prone reheated foods will have higher risk of causing sickness when these bacterial cells survive. Bearing this in mind, you can see why chicken, which is at risk of salmonella contamination, could be a dangerous food to microwave. Before eating chicken, you have to cook it thoroughly to eliminate all present bacteria. Since microwaves don’t fully or evenly cook all parts of the meat, you’re more likely to be left with surviving bacteria, such as salmonella. In one study, out of 30 participants who reheated raw meat, all 10 who used a microwave became ill, whereas the 20 who used a skillet were fine. This goes to show how much bacteria can survive in meat when microwaved, compared to other cooking methods. Check out these other 50 foods nutritionists never eat.

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4. Rice

Rice, really? Well, according to the Food Standards Agency, microwaving rice can sometimes lead to food poisoning. The issue with rice involves the common presence of a highly resistant bacteria called Bacillus cereus. Heat kills this bacteria, but it can have produced spores that are toxic, according to findings in the International Journal of Food Microbiology—and surprisingly heat resistant. A number of studies confirm that once rice comes out of the microwave and is left out at room temperature, any spores it contains can multiply and cause food poisoningif you eat it. (The humid environment of the warm rice makes it an ideal breeding ground.) As is explained on the U.S. government website Food Safety: “B. cereus is a type of bacteria that produces toxins. These toxins can cause two types of illness: one type characterized by diarrhea, and the other, called emetic toxin, characterized by nausea and vomiting. Sources: a variety of foods, particularly rice.” To avoid contaminated rice, heat it to near boiling and then keep it warm (above 140 degrees F) to keep it food safe.

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3. Processed meat

Processed meats often contain chemicals and preservatives that extend their shelf lives. Unfortunately, microwaving them can make those substances worse for your health. In microwaving processed meats, we might unknowingly be exposed to chemical changes such as oxidized cholesterol in the process, according to research in the Journal of Agricultural and Food Chemistry. A study in the journal Food Controlsuggests that reheating processed meats with a burst of microwave radiation contributes to the formation of cholesterol oxidation products (COPs), which have been linked to the development of coronary heart disease. Compared to other meal-prep methods for reheated foods, microwaving processed meats is far more likely to introduce COPs into your diet. Don’t miss these other summer foods likely to give you food poisoning.

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2. Breast milk

Many new mothers freeze and store their breast milk for later use, which is great, as long as it’s not reheated in a microwave. In the same way that microwaves heat plates of food unevenly, they can also warm a bottle of breast milk unevenly, creating “hot spots” that can severely burn a baby’s mouth and throat. Then there’s the carcinogen hazard that comes with reheating plastic. The FDA recommends that breast milk and formula be thawed and reheated in a pot on the stove, or using hot tap water. As a workaround, you could heat a cup of water in the microwave and then drop the bag or bottle of breast milk in it to thaw. Check out these other 12 things you should never put in the microwave.

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1. Hard-boiled eggs

Shelled or unshelled, when a hard-boiled egg is cooked in a microwave, the moisture inside creates an extreme steam buildup, like a miniature pressure cooker, to the point where the egg can explode! Even scarier, the egg won’t burst inside the microwave while it’s being heated, but afterward, which means the scalding hot egg can erupt in your hand, on your plate, or even in your mouth. To avoid turning your egg into a steam bomb, cut it into small pieces before reheating, or better yet, avoid putting it in the microwave all together.

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For starters, a microwave does not cook food evenly, which often means that any bacteria present in the reheated foods will survive. Then there’s the problem of microwave blasts directly contributing to the production of carcinogenic toxins. To minimize the microwave risks, don’t use it to cook or warm these 10 foods.

11 PHOTOS
11 things you should never put in your freezer
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11 things you should never put in your freezer

1. CHEESE
Soft cheeses such as ricotta, goat, or cream cheese tend to separate when frozen and thawed, which leads to strange textural changes. Hard cheeses like Parmesan and cheddar are usually a safe bet, but you're still better off buying only what you need and storing it properly in the fridge.

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2. AND FOR THAT MATTER, MOST DAIRY
Cream, buttermilk, yogurt, sour cream, and custard all separate and curdle in the freezer.

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3. WHOLE EGGS
Eggs can expand when frozen, causing the shell to crack and potentially let bacteria in—never a good thing. Cooked eggs and egg-based sauces like hollandaise, mayonnaise, and meringue are also poor freezer candidates. If you really have to freeze eggs, crack them, whisk them (or separate the whites and yolks) and store in an airtight container.

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4. FRIED FOOD
The crispy, craggily, gloriously fried exterior of fried foods—that is, the best part—is lost when frozen and defrosted. Unless soggy is your thing, keep these suckers away from the cold.

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5. COFFEE
It's OK to freeze unopened, freshly-roasted bags of coffee for up to a month. But once you open the bag and start taking it in and out of the freezer, the coffee can get ruined. Thawing and refreezing yields condensation on the beans which causes them to absorb freezer smells.

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6. SOME PRODUCE
Produce that has a high water content (cucumbers, watermelon, lettuce) gets limp and soggy when frozen and defrosted.

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7. FRESH HERBS
Try to thaw a bunch of fresh herbs from frozen and you'll be left with a brown, soggy mess. Instead, turn your herbs into compound butter or pesto, both of which freeze impeccably.

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8. COOKED PASTA
Cooked pasta turns into a mushy puddle of gluten after it's frozen. Avoid at all costs.

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9. SAUCES THICKENED WITH FLOUR OR CORNSTARCH
Thickened sauces like gravy and béchamel separate when frozen and thawed. Not a good look.

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10. AVOCADOS
The texture of avocados changes when frozen, so you can kiss that silky interior goodbye. (But really, when have you ever had trouble using up a haul?) (Oh, wait, you have? You should probably read this.)

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11. POTATOES
When was the last time you craved a soft, grainy potato? Exactly.

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