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How Microwaves Cook Food. When you hit the start button it usually takes about 2 seconds to heat up a filament inside the magnetron tube, says Schiffmann. The microwaves are then blasted into the food compartment. The commonly used frequency of microwaves, 2.45 gigahertz, is easily absorbed by water, fat, and sugar.
They just heat them. Microwave ovens heat food by producing radiation which is absorbed by water molecules in the food. This makes the water molecules vibrate and produce heat, which cooks the food. Any modern day microwave oven in good condition is perfectly safe as long as you follow the instructions for use.If you use a microwave oven in the correct way there is no known harmful effect on humans.hey just heat them. Microwave ovens heat food by producing radiation which is absorbed by water molecules in the food. This makes the water molecules vibrate and produce heat, which cooks the food. Any modern day microwave oven in good condition is perfectly safe as long as you follow the instructions for use.