Microwaves work by making the molecules in food, the water molecules in particular as we are mostly water, vibrate at millions to billions of times per second. The resulting friction has a secondary heating effect, but this severe agitation damages the food and water molecules, leaving you with dead food and water.
Take a look at these two plants with two types of water, day 1 and day 9 comparisons:
There have been many reports of injury to people using microwave ovens to heat water to make hot drinks. Water heated in a microwave oven may be superheated and when objects (e.g. a spoon) or granulated materials (e.g. instant coffee) are put into it, the water may boil very vigorously or even appear to explode out of the container. The vigorously ejected boiling water can cause serious burns. Sometimes even the act of taking the container out of the oven and or putting it on the bench can cause the boiling