If you crave carbs during the short days of Winter, you are not alone. There seem to be a couple of physiological factors involved. Since there is less sunlight, due to shorter days, our bodies make less vitamin D (aka the sunshine vitamin). It helps keep your mood nice and sunny since it naturally boosts serotonin levels. Serotonin is the feel-good brain chemical that modulates mood, emotion, and sleep. Carbs provide a serotonin rush, so eating all that bread and pasta is a means of self-medicating with food sources. Exercise also creates serotonin, so don't skimp out on your workouts. You need them during these long nights of Winter to keep your spirits up!