We meet this question quite often because it is puzzling at first blush. What we have is raw figures, collected over 40 years in Europe, principally by the German Weather Service. From their work it is clear that certain weather states, which we translate into the Mediclim Index, have an influence on health conditions, one of them being diabetes. We do not know the mechanism by which a weather pattern contributes to the destabilization of this disease but I believe that this is what happens. The maintenance of blood sugar between acceptable 'normal' limits is a complex set of reactions and local atmospheric circumstances (aka the weather) can, it appears, upset the balance. Perhaps in diabetics the regulation of blood sugar is an inherently less stable procedure. We would dearly like to know the exact mechanism, and it is possible that, if we collect enough diabetic volunteers through Mediclim, we could measure the relevant reactions in the same way as an Australian researcher who contacted us in March 09 had done. He told me he had measured the levels of several inflammatory proteins in people as the weather marched through Melbourne and surrounding towns. He showed that there was a consistent variation in the levels of these proteins with weather and I believe this is a clue to what happens in some diseases. In any case, we have the info and that is why we offer the service.  Hope this helps!