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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.
Best Answer: A microwave oven heats food by bombarding it with Microwave energy (a portion of the electromagnetic spectrum, much like visible light or radio waves).When water molecules are hit by a photons in the microwave frequency, they become excited, and move around faster-this is what causes them to heat up. microwave oven works by passing microwave radiation through the food. Water, fat, and sugar molecules in the food absorb energy from the microwave beam in a process called dielectric heating.