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I'd be interested to see them also test for physical activity indoors while surrounded by houseplants or other greenery, as well as high lux indoor lighting to simulate sunlight exposure.

There's been other studies that showed just looking at nature can improve cognitive function and mental health, including house plants. I suspect, outside of the benefits of sunlight exposure, it's less about outside vs. inside and more being in/around greenery/plants.

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I agree with your lighting comment outside sunlight and polarised light affect the body metabolism differently, Indoors kidney works more than outdoors.Also oxygen levels and humidity are better outdoors than indoors.

It could be anything. Better air, light, dynamic environments (in your home everything is where you last left it) - visual, sound, touch. It could be a higher rate of new faces seen and more social interaction. It could be grounding. There's a million variables to control for here

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