"Belly fat is nothing to joke about," the Mayo Clinic warns ominously on its website. Oh, poor Santa, chuckling away, so blissfully unaware.Stress is another risk factor for high blood pressure. Sure Santa seems to take it all in stride, always quick with a "Merry Christmas" and a ho, ho, ho. But all that double-checking of lists, monitoring of everyone's sleep habits and the sheer deadline pressure -- surely it would take a toll. Thank goodness Santa will never have to fill out a life insurance application or undergo a life insurance medical exam -- we wouldn't want to hear the results.