Winter is coming, and we are packing on the pounds. But surely our bodies are physiologically preprogrammed to pad on added insulation in the winter, right? Sorry, but no… not unless you are a hibernating bear.
While cold winter weather does produce a slowing of our body’s metabolism to compensate for the dramatic shift in temperatures, it is not nearly as profound as in other mammals, such as woodchucks or bears. Interestingly, recent clinical studies do suggest that we have “circannual cycles,” meaning cyclical changes in blood chemistry, hormone secretion, brain activity, and appetite. These circannual rhythms appear to relate to changes in the length of daylight and darkness, causing seasonal deviations.