The following is a paper by H. Aspden published in Electronics World, pp. 774-775 (1991).
Commentary: The author here discusses the curious fact that overhead power lines, whether operating at 50 Hz or 60 Hz, can induce damaging electromagnetic resonance effects in our body fluids. This article was written in order to draw attention to a simple technique for avoiding the related problem that had been traced to electric blanket use. By using a full-wave bridge rectifier with no need for smoothing, the power frequency of the alternating current could be eliminated and replaced by a current that is mainly direct current which higher frequency harmonics of the basic power frequency. The scientific explanation of the resonance at 50 Hz and 60 Hz was later explained in a separate reference. See Energy Science Report No. 10 as abstracted in the Book and Report section of these Web pages.