Does Microwave Thawing Make Meat Unsafe?

Verdict: False. USDA lists the microwave as one of three safe ways to thaw food, as long as you cook the food immediately after thawing.

Where the idea comes from

Microwave defrosting often looks wrong. The edges of a chicken breast turn gray and start to cook while the center is still icy, and many people conclude that this uneven result must be unsafe. Food-safety advice that says "thaw in the refrigerator" adds to the impression that every other method is a risk.

What the evidence says

USDA's Food Safety and Inspection Service, in Freezing and Food Safety, names three safe ways to thaw food: in the refrigerator, in cold water, or in the microwave. Its condition for the microwave is simple: "When microwave-defrosting food, plan to cook it immediately after thawing." It also lists places never to thaw food, including the kitchen counter, a garage, a car and the dishwasher.

Clemson Cooperative Extension's microwave food safety fact sheet explains why the rule exists: "During microwave defrosting, parts of the food may begin to cook while other areas remain frozen." Those partly cooked edges sit at temperatures where bacteria can grow. "If partially cooked food is left at room temperature, bacteria can multiply." Its instruction is to cook meat and poultry immediately after microwave thawing.

The same sheet adds a packaging warning: remove food from store packaging before defrosting unless the packaging is labeled microwave-safe, because foam trays and plastic wraps may melt or warp when heated.

So the uneven look that worries people is real, and it's exactly why the cook-right-away rule matters. It doesn't make the method unsafe.

What to do instead

1. Take the meat out of its foam tray and plastic wrap, and put it in a microwave-safe dish.
2. Use the microwave's defrost setting or a low power level, following the manual's guidance for the weight.
3. Turn or separate pieces partway through so they thaw more evenly.
4. Move straight from thawing to cooking. Don't put microwave-thawed meat back in the fridge for later.
5. Cook to a safe internal temperature, checked with a food thermometer.

Exceptions worth knowing

• •Refrigerator thawing gives you flexibility. USDA says food thawed in the refrigerator can be refrozen without cooking; it gives no such allowance for microwave-thawed food, which it says to cook right away.
• •Large roasts or whole birds thaw poorly in most home microwaves. The refrigerator is the better choice when you can plan ahead.
• •A turntable that doesn't turn makes uneven thawing worse. Check that the tray is seated and turning.
• •Cooking in the microwave has its own uneven-heating issues. See whether a microwave cooks food from the inside out.

Sources

• •USDA FSIS: Freezing and Food Safety (three safe thawing methods; cook immediately after microwave thawing; places never to thaw)
• •Clemson Cooperative Extension: Microwave Food Safety (edges cook while the center stays frozen; remove packaging; cook immediately)

The short version: Microwave thawing is safe when cooking follows right away.

A turntable that won't turn, or a defrost setting that cooks the edges every time, can be checked. Call TrueFix Los Angeles at (213) 787-3989 or book microwave repair.