How Everything Works
How Everything Works How Everything Works

Question 318

I'd heard that if I cook in the microwave oven, there will be a possible formation of free radicals. Is it true? If yes, how? — Angela I.
It's doubtful that microwave cooking forms free radicals in food. The microwaves in a microwave oven cook by exerting torques on the water molecules and gradually increasing the water molecules' thermal energies through friction-like effects. There is never enough energy present in a single molecule at one time to shatter that molecule and form a free radical. While ultraviolet light, such as that found in sunlight, carries enough energy per photon (particle of light) to split a molecule and form a free radical, microwave radiation carries very little energy per photon. That's why microwave photons can't do chemical damage the way ultraviolet photons can. However, even if microwave radiation could form free radicals in food, that wouldn't necessarily cause you trouble when you eat that food. So much happens to the food before it enters your blood stream that a free radical probably won't survive. The more harmful free radicals are ones that are actually created inside your body, where they can immediately attack important molecules in your cells.

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