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This is the same thing as Vitamin D is good for health. Exposure to the sun is correlated with good health, the problem is the direction is the other way around
by PaulKeeble 2y ago
This is the same thing as Vitamin D is good for health. Exposure to the sun is correlated with good health, the problem is the direction is the other way around healthy people are outside and in the sun more, hence they have higher Vitamin D levels.
- deleted 2y ago[deleted]
- _xiaz 2y agoImagine this was controlled not only for Vitamin D but for physical activity