Seasonal affective disorder (SAD) is defined as winter depression. It is triggered by the onset of winter, and it is thought to be due to the decrease in sunlight, which decreases vitamin D levels. Studies have shown that low vitamin D may be linked to depression [1]. SAD is typically treated with light therapy, psychotherapy and medications such as antidepressants. Symptoms of depression include loss of interest in things you were once very interested in, irritability, fatig