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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.
Microwave ovens work with powerful high-frequency radiation (microwave radiation). This radiation is absorbed by food and transformed into heat. Food heated by microwave ovens does not actually contain any microwaves and therefore does not give off radiation.The metal case of a microwave oven and a metal-wire screen in its door ensure that most of the radiation stays inside the appliance. A small proportion leaks out.ood heated by microwave ovens does not actually contain any microwaves and therefore does not give off radiation. The metal case of a microwave oven and a metal-wire screen in its door ensure that most of the radiation stays inside the appliance. A small proportion leaks out.