Many causes, if the negative voltage is insufficient even Radio Waves can stop DNA unfolding..
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Every cell in the body is designed to run at -20 to -25 millivolts. To heal, we must make new cells. To make a new cell requires -50 millivolts. Chronic disease occurs when voltage drops below -20 and/or you cannot achieve -50 millivolts to make new cells. Thus chronic disease is always defined by having low voltage.