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The Effects of Light on Cortisol
When we're viewing light at a phase of the natural light dark cycle, we put our body under tremendous amounts of stress. And I think there's so many people in these terrible cycles. Exercise is like this amazing pharmacological factory that produces all these anti-anxiety and sleep-promoting hormones. We've got osteocalsium when you put weight on your long bones that increases spatial reasoning and memory. If you're not moving your body, your brain actually thinks there's something wrong with you. So there's a sedentary depression hypothesis.