Phil210,
There’s quite a lot of research in this. try “uv light increases testosterone research” in your favorite search engine. If I remember correctly one potential mechanism is that uv light decreases production from glands in the brain that suppress testosterone. There are others and I’m not sure that the research is at the level where they have actual mechanisms rather than potential mechanisms. We do know that a lot of our bodily function are controlled by circadian rhythms and that light plays an important part in regulating that. Obvious we evolved before clothes and our bodies are designed to receive sunlight.
JinnGB,
Sometimes diet seems to cause sunburns. There’s a bunch of anecdotal evidence on that coming from the carnivore community. The synopsis is that people who always burned, no longer do. I’m not aware of any research on that though. Maybe in another 10-20 years we’ll have something.
The method of slowly increasing exposure prevents burning. The reason we burn is because we subject our bodies to too much sun too quickly. If we can ration the sun initially our skin builds up resistance.
This whole avoiding the sun thing is a very recent thing. Humans living in buildings is pretty recent. The majority of our time on this planet as homo sapiens has been as hunter gathers. You get a lot of sun as a hunter gatherer, even in northern climes.
It sounds like you live in a northern clime.