The influence of unnatural radiation on the human body is assessed by the authorities (government and policy makers) on the basis of an increase in body temperature. Radiation causes heat, which can cause the body temperature to rise. The authorities consider a local temperature increase that does not exceed 1 degree Celsius to be safe for humans. So if you hold your cell phone half an inch from your ear while calling and the temperature of your cells in your ear does not rise more than 1 degree Celsius, then calling with a cell phone is healthy according to EU guidelines. Underfloor heating or the sun would be declared unhealthy in this way. This method does not consider other biological changes in the body that may be caused by radiation.
Professor Dr. Martin Pall, Emeritus Professor of Biochemistry and Fundamental Medical Sciences at Washington State University, has conducted many studies on this subject. He discovered several neurological disorders associated with non-harmonic EMF radiation, including sleep disorders, headaches, fatigue, symptoms of depression, restlessness, and stress (Prof. M. Pall, Journal of Chemical Neuronatomy, 2016). Unnatural radiation, the man-made electromagnetic fields, causes a significant imbalance in the natural EMF of the human body. More than 30 studies have demonstrated the negative influence of non-natural EMF on humans.