Podbit · The Diary Of A CEO with Steven Bartlett
The redhead gene evolved in northern latitudes like Scotland to remove skin pigment and maximize vitamin D production from weak sunlight. But transplant that gene to Texas, and the lack of melanin becomes a liability in high-UV environments.
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At 1:32:17 · chapter starts 1:30:27
Bartlett raises the practical objection: he lives in London, where sunlight is scarce for much of the year. Dr. Gominak responds by explaining the melanin-sunlight adaptation story. Melanin protects DNA by absorbing UV energy — people with more melanin are protected at high-sun latitudes but produce less vitamin D per unit of exposure. The redhead gene, which arose in northern Viking-age Scotland, reduced melanin across most of the skin, leaving only freckles, specifically to maximise D production in weak northern sunlight. Transplant those genetics to Texas, however, and the lack of melanin becomes a hazard in high-UV environments. Bartlett then cites USA Today data: 90% of Americans spend close to 22 hours indoors daily, and 20% never go outside at all. He also presents cloud-cover data: up to 80% of UV can penetrate light cloud, but dense storm clouds block 70–90% of UVB, making meaningful D production nearly impossible. Dr. Gominak confirms that windows block UVB entirely, so sitting by a window produces no vitamin D. She notes UVA tanning beds tan the skin but do not produce D — only UVB-emitting beds do. She also makes a strong point about infrared radiation: simply sitting on a porch outside, even in shade, delivers infrared energy to the mitochondria, and incandescent bulbs (now largely replaced by LEDs) replicate this wavelength in a way LED lights cannot.
The widely shared claim that we have a credit card's worth of plastic in our brains may be a massive overestimate. Researchers used nitrile gloves to measure microplastics — and nitrile gloves shed microplastic particles onto the measuring device. A second paper found the original tool used was unreliable, and that we may have far less plastic than reported.
RSD isn't just hurt feelings — it's a dopamine-deficient brain with a hyperactive amygdala and a frayed connection to the prefrontal cortex. Add a surge of norepinephrine and you get chest pain, sweating, and trembling that convinces your body something catastrophic is happening.
In Dan Ariely's door experiment, participants sacrificed the highest-reward door — repeatedly — just to avoid seeing other doors disappear. Even when researchers trained them to use the best door, they kept wasting clicks to maintain options. This is the bias that runs our lives: we'll take a worse outcome to preserve the feeling of optionality.
Dan Gilbert discovered that the brain has a 'psychological immune system' — it misremembers, reframes, and rationalizes to keep you satisfied with whatever you chose. The fear before commitment is all about potential regret. But after committing, your brain quietly starts justifying the choice — and the more irreversible the decision, the stronger the effect.
The psychological immune system can get you through the first few months of any commitment. But durable, long-term well-being requires self-concordance — choosing commitments that are genuinely aligned with your values and what you actually want. Without that alignment, the satisfaction fades fast.
Vision didn't just help animals find food — it ignited the Cambrian explosion of speciation. Half of the human cortex is devoted to visual processing, and that same visual hierarchy directly inspired the neural network architectures powering today's AI.
Peptides come loaded with a powerful narrative: regenerative, subcutaneous, targeted, cutting-edge. That narrative can genuinely move outcomes, especially for pain, energy, and recovery. The RCT's job is to quantify how much additional benefit comes from the molecule itself — above and beyond the compelling story surrounding it.
A pharmaceutical is not an amino acid sequence — it is the successful solution to manufacturing, purification, formulation, and consistency challenges. When clinical trials prove a drug works, they validate a specific product under specific processes, not every preparation that shares the same sequence.
Ask one question of any peptide advocate: what evidence would prove this claim wrong? If every disappointing result gets attributed to wrong dose, bad supplier, wrong timing, or improper stacking, the hypothesis is not falsifiable — and a non-falsifiable claim is not a scientific claim.
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