As we trudge deeper into the depths winter, many people experience some degree of mood change. We feel less motivated, sentimental, anxious or depressed. For some, these changes are slight and manageable; they may simply feel a bit more fatigued, have a harder time waking up in the morning, or occasionally feel bummed out. With the cold and grey weather, a lot of people opt to stay home, which can lead to feelings of isolation. Although Denver winters can be beautiful, sunny and full of outdoor activities like skiing, snowboarding, and winter hiking, we become more sedentary. Winter has a clear effect on us -- and our bodies respond to that change.