I don't know what definition of "photon" you are using but I don't think it is appropriate to describe the effects of microwave radiation, which occurs at very

I don't know what definition of "photon" you are using but I don't think it is appropriate to describe the effects of microwave radiation, which occurs at very different wavelengths as visible light, which "photon" traditionally refers to. EM radiation at ~microwave levels has well-known effects, it's true, such as protein denaturing and other localised internal heating. The effect of randomly, and perhaps partially, denaturing proteins over long periods of time in important parts of your body is rather ill-studied, I would have thought.