Rowan Jacobsen

speaker

1,919 appearances 4 recordings 4 series first heard Jul 2022 last heard 26 Jun

Rowan Jacobsen’s voice in public audio — every appearance, attributed to the second.

Trend

recordings per month · last 12 months

Recordings per month over the last 12 months — 3 in all, peaking in Jun 2026 with 3.

Appearances

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The Joe Rogan Experience · #2516 - Rowan Jacobsen · 18 Jun 2026 podcast

He's like, okay, so something about diet.

But then he got lucky because he had deprived the dogs of sunlight.

And that's why they got rickets.

So then eventually they realized that...

light hitting cholesterol molecules in the skin actually converts the molecules to vitamin D. So vitamin D is like downstream of cholesterol, but it takes that same ultraviolet light that can screw up your DNA.

It actually breaks a bond in the cholesterol molecule, which allows it to, it gives it some movement and it flips around into a new form that's vitamin D. So once I figure that out,

Um, then they're like, son's really good for you.

So we had this era in like the twenties, thirties and into the forties when everyone thought son would cure everything.

And they like went after it hard.

Yeah.

Like they, parents would send their kids up into the Alps in like the twenties to institutes for heliotherapy.

Kids would ski around in their underwear, take classes in their underwear.

There's awesome photos from this, this era.

Um,

Like the instructors are in their underwear in the mountains outside in Switzerland teaching the kids, and everyone looks really healthy, right?

So there's kind of like this idea that you couldn't get too much light.

So people are literally burning themselves on purpose for health.

Yeah.

So to give it away, now it looks like –

For melanoma, which is the most dangerous type of skin cancer, it's associated with burning strongly, but not with gentle, moderate, everyday sun exposure.

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