  Recently, Mackenzie et al. reported incidence and prevalence of multiple
sclerosis (MS) in the UK from 1990-2010. Authors of this report indicated that
they could not explain the cause of decreasing MS incidence trend in the UK
during this time period. Such inability mainly resulted from the fact that
often-cited hypotheses of MS, such as vitamin D deficiency hypothesis, cannot
provide any answer for MS incidence trends. However, the newly proposed
hypothesis of MS that is based on the biological effects of geomagnetic
disturbances (GMD) has the ability to provide explanations for this observed
trend. In this commentary, we showed that there is a significant correlation
among alterations in GMD with changes in MS incidence and explained how
researchers can use GMD hypothesis to evaluate such relations. Moreover, we
clarified why we need a revision in the method of reporting MS incidence data
to find actual environmental factor of MS.
