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'Home Food Safety Mythbusters' Zaps Microwave Misconception
Wednesday, October 31, 2012 • Posted October 31, 2012

In researching some information for the 4-H foods projects this week, I came across some interesting food safety “myths” from the “Fight Bac” website. These are questions I get all of the time so I hope they will be of interest to you. Enjoy!!

Microwaving, nuking, zapping – whatever you call it – using a microwave oven to cook or reheat foods can be fast and convenient, but it’s not effective at killing harmful bacteria if the food isn’t heated to a safe internal temperature, according to the non-profit Partnership for Food Safety Education.

“Food safety education is a critical part of our public health prevention strategy,” said Michael R. Taylor, Deputy Commissioner for Foods at the U.S. Food and Drug Administration.

“Everyone along the farm-to-table chain—growers, manufacturers, transporters, retailers and consumers—has a responsibility for food safety.”

The misconception that the microwaves — rather than the heat that microwave ovens generate – kill bacteria is one of this year’s four featured myths. The myths are presented with the facts consumers need to know to reduce their risk of food poisoning.

* MYTH: “If I microwave food, the microwaves kill the bacteria, so the food is safe.”

Fact: Microwaves aren’t what kill bacteria – it’s the heat generated by microwaves that kills bacteria in foods. Microwave ovens are great time-savers and will kill bacteria in foods when heated to a safe internal temperature. However, foods can cook unevenly because they may be shaped irregularly or vary in thickness. Even microwave ovens equipped with a turntable can cook unevenly and leave cold spots in food, where harmful bacteria can survive.

Be sure to follow package instructions and rotate and stir foods during the cooking process, if the instructions call for it. Observe any stand times as called for in the directions. Check the temperature of microwaved foods with a food thermometer in several spots.

* MYTH: “Of course I wash all bagged lettuce and greens because it might make me sick if I don’t.”

Fact: While it is important to thoroughly wash most fresh fruits and vegetables, if packaged greens are labeled “ready-to-eat,” “washed,” or “triple washed” then the product does NOT need to be washed at home. Pre-washed greens have been through a cleaning process immediately before going into the bag. Re-washing and handling the greens creates opportunities for contamination.

Always handle pre-washed greens with clean hands, and make sure cutting boards, utensils, and countertops are clean.

* MYTH: “I don’t need to use a food thermometer. I can tell when my food is cooked by looking at it or checking the temperature with my finger.”

Fact: The only sure way to know food is safely cooked is to check the temperature with a food thermometer and confirm it has reached a safe internal temperature. Color, texture and steaming are not indicators that a food is safe to eat. The outside of a food might be steaming hot, but there may be cold spots inside. Temperature must be measured by a food thermometer. This will help ensure not only that a food is safely cooked, but that it is not overcooked. Remember to clean your food thermometer with soap and water after each use.

* MYTH: “I can’t re-freeze foods after I have thawed them – I have to cook them or throw them away.”

Fact: If raw foods such as meat, poultry, egg products, and seafood have been thawed in the refrigerator, then they may be safely re-frozen without cooking for later use. Never thaw raw foods by letting them sit on the kitchen counter. If raw foods are thawed outside of the refrigerator, for example in the microwave or in cool water, they should be cooked immediately.

Never re-freeze raw or not fully cooked foods that have been thawed outside of the refrigerator.

About one in six Americans – 48 million people — will get a foodborne illness this year, according to Centers for Disease Control and Prevention estimates. The Partnership launched Mythbusters in 2009 to address common food safety myths and to give consumers actionable steps they can follow to protect themselves and their families from food poisoning.

“We support the Partnership’s efforts in drawing attention to common misconceptions about safely preparing food during National Food Safety Education Month,” USDA Under Secretary for Food Safety Dr. Elisabeth Hagen said. “Providing accurate food safety information to consumers is a key component to protecting families across the nation from foodborne illness.”

Mythbusters educational materials, including a PowerPoint Presentation, a teachers’ kit, games for children, and more, are all available for free at

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