Observed changes in body mass index are probably unrelated to effects on the immune system but are a well-documented and experimentally simple fact which is a further confirmation of the existence of low power effects of electromagnetic waves.
Under 900 MHz (GSM) exposure, the weight of mice, hamsters and rats increases by about 5%. This increase is essentially independent of exposure power, although for very high exposure (above 300 V/m) it can be reversed due to general ill health of exposed animals. It has been observed down to 1 V/m exposure – an exposure power which is quite common for exposure of the human population – and it may exist for far lower exposure levels. It was also observed for daily exposure of mice of only 1h/day.
Since this weight increase was observed in several animal species, it is likely to affect a wide range of species, including humans. Since the threshold for the effect may be very low, it may have affected a majority of the human population in countries using mobile telephony systems in the 900 MHz range, such as GSM, merely due to exposure from emissions coming from mobile telephony base stations. Since this weight increase takes place even for short daily exposures, the sole exposure of mobile phone users (and of people staying near them) during calls may also has caused this effect. Thus, there is a strong presumption that the increase of the Body Mass Index of the French population following the introduction of GSM in 1992 (see figure) is due to GSM rather than any cultural modification of feeding habits.
This phenomenon was simply inconceivable under the “Doctrine of Innocuity of Electromagnetic waves”. However, based on stimulated transitions between different conformations, it is explainable.
An analogy can be made with the recognition of antigens by lymphocytes. For a specific antigen, antigen presenting cell (APC) and lymphocyte, the recognition process yields to a binary outcome (destruction/non-destruction of the APC). The electromagnetic wave inhibits recognition of the antigen, and there is thus necessarily a threshold power above which the recognition process has its normal outcome (destruction) and below which it has a modified outcome (non-destruction). This threshold power can be anywhere above a theoretical minimum of about 0.002 V/m. Likewise, some kind of receptor implied in weight regulation can potentially be affected by a 900 MHz electromagnetic wave above an unknown threshold which is in any case below 1 V/m, which explains the observed weight increase under GSM exposure.
Whilst this phenomenon is not as well-understood as effects on the immune system, it is nonetheless a very simple and easily verifiable experimental fact which confirms the existence of effects of electromagnetic waves at very low power.
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