This time of year -- when they days are cold and short and summer seems like decades away -- everyone is prone to Seasonal Affective Disorder (SAD), a sort of 'winter blues' condition (symptoms listed here.) SAD isn't too serious -- it goes away from spring, after all -- but it can have some lasting effects, like weight gain. Because, not only are you exercising less, when you're feeling blue you reach for your comfort foods.

This year, nip the SAD in the bud with light therapy. According to experts over at The Daily Mail, a lightbox will run you around $200 and will help brighten up your home and your mood. Another sure cure? Exercise does a body -- and a mind -- a world of good.