What Causes Seasonal Depression?
4 Dec 2025 · 1 min

0:58
YouTube video by Gary Brecka explaining seasonal affective disorder (SAD): how reduced sunlight during shorter days alters brain chemistry, hormones (including vitamin D3 decline), and social/physiological factors to produce depressive symptoms (oversleeping, carb cravings, low energy). The speaker outlines that SAD is multifactorial (biological, physiological, social) and introduces seven practical mitigation strategies.










