How harmful is it to use microwave oven to warm the food?

It is the most convenient thing in the kitchen, but at a consequence. The microwave ruptures water cells in the food with micro waves going through it (kind of like radiation). The rupturing of the cells causes the vitamins and nutrients and omega 3's to disperse and basically wither. If you use a microwave all the time, maybe it's a smart choice to put the extra time into heating the food on the stove or in a toaster oven (but only if you have the time).