What Causes Seasonal Affective Disorder?
Seasonal affective disorder, also referred to as winter or seasonal depression, is a syndrome with depression that starts and ends at the same time each year. There are two types of SAD: fall-onset SAD and summer-onset SAD. The fall-onset type, often called “winter depression,” is more recognized. With less sunlight during these two seasons, the brain does not produce enough serotonin, the soothing neurotransmitter in the brain. This results in feelings of depression. The National Institutes of Health estimates that more than 36 million Americans suffer seasonal depression that occurs in the fall. Hormones manufactured in the brain automatically trigger a change in attitude at a certain time of year. Experts say these hormonal changes are related to SAD’s symptoms of depression, fatigue, carbohydrate cravings, and weight gain. Because foods high in carbohydrates (like chips, pretzels, and cookies) boost serotonin, it is thought that they have a soothing affect on the body and mind. SAD
