Here's a simple explanation of how nnEMFs negatively impact our health (affect anything from fertility, to hormones, to sleep etc) .

We (humans) evolved amid natural low-level, unpolarized ELF/geomagnetic fields and electromagnetic frequencies such as 300GHz, 300MHz or even 60Hz that can be found in sources of nnEMFs ranging from your smartphone all the way to radars and satellites.

So unlike native EMFs, which occur naturally from the earth’s magnetic field or sunlight for example, nnEMFs have frequencies, intensities and patterns that differ from those our biology evolved to handle.