Jonathan Jarecki

Yeah, so really fascinating study.

The southern Sweden cohort study, right?

Basically, what these researchers did was they took women in southern Sweden, almost 30,000 women.

They tracked these women over a 20-year period, and they looked at their light exposure habits, so how much sunlight they got.

they had three sort of groups of women, right?

The woman who got the least amount of sun, the woman who got a little bit more, right, right in the middle, and then the woman who got the most amount of sun exposure.

They did this from a survey, right?

So they surveyed these women, gauged their average amount of sun exposure, and then they looked at their health outcomes throughout their lives.

And what they showed was that the woman who had the most amount of sun exposure had the longest lifespan.

So they had the longer lifespan compared to the woman who had the least amount of sun exposure.

And the data there was they lived two times longer lives than the woman who had the least amount of sun exposure.

This is a correlational study, right?

So we can't conclude causation from that.

But what's really interesting is that they showed what's called a dose-dependent curve.

In correlational studies, if you have a dose-dependent curve, meaning that if you increase the dose of something, right, you increase, let's say, a medication, or you increase, in this case, sun exposure, you have a

increase in whatever that outcome is, right?

In this study, it was mortality.

So what they saw was that as you increase sun exposure, as you go from the least amount of sun exposure to the middle, to the most, right?

You had an increase in longevity, right?

You had a decrease in mortality.