I read somewhere that a man dies if he is isolated from natural electromagnetic fields and waves. (I imply fields of radio frequencies and below.)
Is it true?
I've never heard of such a thing, and a quick Scholar search didn't yield anything significant. In fact, artificial radio waves are used in things that usually save lives, like MRIs.
If we were truly agnostic about this, we could say that it might or might not have an effect on human survival due to the general lack of evidence or even indication of a claim, but like the orbiting teacup, it's safe to assume that given our current extensive set of knowledge of biology, radiowaves do not affect human at all, and that as it has not been observed, the claim doesn't have a scientific basis.