Vincent's University Hospital in Dublin found that in reality eating a sugary snack can temporarily lower your testosterone levels, which in turn can sap your sex drive, whether male or female. Try to give her libido a boost by eating chocolate. While splashing out on a pricey light-therapy box used to be one way of getting her in a better mood, and thus in the mood, studies reported in the J ournal of Clinical Endocrinology and Metabolism have found that simple blue light is twice as effective. Studies by Indiana University have found that men pile on a minimum of 1kg over winter because cold weather makes you want to eat more. Winter weight gain saps your sex drive. Enter your email address: You are biologically programmed to lose your sex drive in winter.