Rowan Jacobsen
speaker
216 appearances
1 recordings
1 series
first heard Jul 2026
last heard 27 Jul
Rowan Jacobsen’s voice in public audio — every appearance, attributed to the second.
Trend
recordings per month · last 12 monthsRecordings per month over the last 12 months — 1 in all, peaking in Jul 2026 with 1.
Appearances
Like, yes...
Sunlight raises your risk of skin cancer, but if it lowers your risk of heart disease, then how do we pick, right?
It's not a vitamin.
It got misnamed back when they discovered it in the 20s.
It's a hormone.
And it's used in tons of different ways by the body.
We used to, 20 years ago, think it was like the magic bullet that was like the wonder drug that could cure everything or could at least prevent disease across the board.
And that was because when we looked at levels of vitamin D in people's blood, the ones who were deficient in vitamin D had higher levels of
every disease you can think of cancers heart disease autoimmune diseases depression diabetes dementia you name it raise vitamin d and you should have lower levels of all those things the easiest way to do that would be to tell people to go out in the sun but we didn't want to do that because we didn't want to raise people's risk of skin cancer so so instead um
The advice was stay out of the sun, but take vitamin D supplements.
But there's been huge clinical trials to prove that worked.
And they have across the board failed to show that these vitamin D supplements fix any condition whatsoever.
It was, except it turns out conventional wisdom is really hard to upend.
You can upend it in practice, or in theory, but in practice it's really hard.
But that was another big mystery.
Like, how could that be?
If people with naturally high levels of D have lower rates of all these diseases, then how come raising that D artificially with pills makes no difference?
Any guesses?
Oh, you knew.
So D was just a marker for sun exposure.
Showing 141–160 of 216 · page 8 of 11
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