Seasonal Affective Disorder (SAD) is defined as recurrent depressive episodes that occur yearly in the fall and/or winter seasons and remits spontaneously in the spring. Although this syndrome is now being fully recognized as a valid disease, the physiologic pathways are still not well understood. Several theories exist surrounding SAD. Most focus the absence of sunlight during the winter months (artificial indoor light is not a protective or therapeutic measure) causing hormonal imbalances in the brain, particularly the pineal secretion of melatonin. Other theories focus on SAD being associated with deficiencies in serotonin synthesis which is melatonin’s close cousin in biochemical pathways. The common unifying element is that lack of sunlight does seem to influence serotonin and melatonin regulation which in some people makes them susceptible to the symptoms of SAD. (Murray & Bongiorno, 2006) Those of us most likely to experience SAD are: those living in temperate zones...
The Blog of Sound Integrative Health . The Kirkland, Washington Naturopathic Medicine clinic.