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.
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recordings per month · last 12 monthsRecordings per month over the last 12 months — 3 in all, peaking in Jun 2026 with 3.
Appearances
Like one is stuff you make with that energy, like vitamin D. One is the way your body uses that light as a signal and signals, basically your skin will send signaling molecules to the rest of the body
letting your body know what's going on out there in the world.
Is it day?
Is it night?
Should you be active?
Should your metabolism crank up?
Or is it time to store calories as fat?
And then the third thing that I think light is doing for us is it's sort of a healthy stressor.
It's hormesis is the word that the scientists use for anything that is sort of like a fire drill for the system.
Like it's a little bit of a test, but a test that the body then rises to meet
and ends up better able to deal with tests in the future.
So exercise is, I think, the best example of hormesis, where it's hard on the body in the moment of doing it, but then the body goes, whoa, that was hard.
I better be ready next time.
So I'm going to fix the damage.
I'm going to build more muscle, more lung capacity, whatever, so that I can be even better at it next time.
And the body ends up in a better place for the test.
And I think sunlight is kind of like exercise for your skin in that sense.
Yeah, it's clear the sunlight is doing other things and that the D that we take orally doesn't act the same as the D that we naturally make in our skin.
I don't think anyone has quite figured out what's going on there, but something's going on.
And the backstory is that scientists started noticing a few decades ago
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