Seasonal Affective Disorder (SAD): the link between sunlight and health

Sunlight helps to regulate the hormones serotonin and melatonin, it has also been shown to affect brain blood flow. Thus, sunlight may not only affect mood directly, but also via its effect on cognition, because cognitive impairment can underlie a depressive episode. A lack of vitamin D, which is synthetized in the presence of sunlight,

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