![]() fall and winter seasons, and exacerbated by higher latitudes, where daylight is short or nonexistent, less light passes through the eyes, which inhibits the release of an important brain chemical serotonin. This determined that human physiology is influenced by light.ĭuring the. In 1980 researchers at the National Institutes of Mental Health demonstrated that high-intensity light affects the natural release of metatonin by the pineal gland in the brain. What causes SAD? Experts agree that there is a link between decreasing sunlight during the fall and winter months and a chemical imbalance in the brain.
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