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An open microwave oven with a bowl of vegetables on its glass turntable.
Technology

Does microwaving food make it radioactive?

Published

Verdict
False
Verification confidenceHigh

Explanation

No. Heating food in a microwave oven does not make it radioactive. Microwave cooking uses non-ionizing electromagnetic radiation to transfer energy to food.

The FDA explains that food absorbs microwave energy and converts it into heat. Health Canada independently confirms that this process makes neither the food nor the oven radioactive, and that microwaves do not remain after the oven is switched off.

Radiation and radioactivity are different concepts. An appliance can use electromagnetic radiation to heat a meal without making that meal radioactive. Hot food and containers can still cause burns; that is a separate issue from radioactivity.

Key takeaway

Microwaves heat food without making it radioactive. The heat can remain after cooking; the microwaves do not.

Evidence

Absorbed microwave energy becomes heat

U.S. Food and Drug Administration

Contradicts the claim

The FDA explains that absorbed microwave energy heats food without making it radioactive or radioactively contaminated.

Based on: U.S. Food and Drug Administration

Microwaves do not remain in the food

Health Canada

Contradicts the claim

Health Canada states that microwave ovens do not make food radioactive and that microwaves disappear when the oven is switched off.

Based on: Health Canada

Sources

U.S. Food and Drug Administration

Microwave Ovens

Health Canada

Microwave ovens

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