Podbit · The Diary Of A CEO with Steven Bartlett
For a century, medicine told us bacteria were the enemy. Then patients dying of C. difficile infection were cured by transplanting stool from a healthy donor. That reversal is now reshaping our understanding of the microbiome as a life-sustaining system.
Where this was said
At 1:04:00 · chapter starts 1:00:26
The episode's most structurally important chapter opens with a deceptively simple question from Bartlett: what links vitamin D to B vitamins? Dr. Gominak's answer: the gut microbiome. The 8 B vitamins were first described in the scientific literature as bacterial growth factors — chemicals produced by one bacterium and shared with its neighbours in a commensal arrangement. Four large groups of bacteria form the normal human microbiome, and they cluster together precisely because each needs at least one B vitamin and produces at least one. Scientists now have the genetic footprints of all approximately 200 normal gut bacteria from mouth to anus but have fully characterised only 2% of them. The conceptual leap: the microbiome is not just affected by what we eat — it is the production system that supplies the body's B vitamins. When vitamin D deficiency disrupts the microbiome, the production system fails. Dr. Gominak illustrates this with the extreme example of fecal transplants: medicine spent a century treating bacteria as the enemy, then watched dying patients with C. diff infections survive when given another person's stool, forcing a complete reversal of the conceptual framework.
All 8 B vitamins are primarily produced by gut bacteria, not food. When vitamin D is low, gut bacteria die off. When gut bacteria die off, B vitamin production collapses. That's why taking vitamin D alone can trigger a B deficiency cascade.
All eight B vitamins are produced by gut bacteria and absorbed by the body — not primarily from food — making the gut microbiome the body's primary B vitamin production system.
The 8 B vitamins were originally described as bacterial growth factors. Bacteria produce them, share them with neighboring strains, and deliver them to the body. When the wrong bacteria dominate — as happens without enough vitamin D — the production line shuts down.
Despite having genetic footprints of all ~200 normal gut bacteria, scientists have only fully characterized 2% of them, meaning most microbiome interactions remain unknown.
A 32-year-old patient on 9 drugs with daily headaches, severe pain, depression, and digestive failure was transformed after the Right Sleep Protocol. Depression gone. Three pain medications stopped. She enrolled in a back-to-work program.
Patient 'Madeline', severely deficient, required 30,000 IU of vitamin D daily for 4 years — six times the typical dose — to keep her blood level stable at 60 ng/mL.
Spike your cortisol in the first 1–3 hours of your day — with sunlight, hydration, exercise, or caffeine — and you set up elevated mood, focus, and stress resilience for the rest of the day. Miss that spike and you get a flat cortisol curve: brain fog, poor learning, and bad sleep. The bookend is equally important: dim lights, no caffeine, and wind down the final hour.
Bottom-up impulses — just eat the cookie, keep scrolling — are driven by deep brain structures. Top-down prefrontal control is the thing that lets you wait, learn, and grow. Every small act of choosing the harder thing, from picking up trash to doing the workout you dread, greases that top-down circuit — and it transfers to everything else.
A Washington University in St. Louis study found that the attention-improvement effects of Ritalin are effectively equal to a great night's sleep. Stimulants also stunt growth and reduce sleep quality. The new direction is combining lower medication doses with genuinely better sleep — not replacing sleep with pharmacology.
Two big inhales through the nose, then a full exhale to empty — that's the physiological sigh. It fires a specific vagal pathway to slow your heart rate, offload CO2, and tip the autonomic nervous system toward calm instantly. Doing just 10 deliberate exhales throughout the day measurably elevates HRV by nighttime.
Presence isn't a state you fall into — it's something you actively produce by anchoring perception to the immediate environment. Ask 2–3 trivially specific questions about your surroundings (how many cans, what does it smell like) to pull your brain out of past/future mode. Then deliberately choose what to think or say next. That's it.
Acknowledge the thing, feel all of it, uncouple the emotion from the memory, then transmute the experience into something meaningful. Most people stall at step 2 — feeling the feelings — and never reach uncoupling. An entire generation is stuck there, confusing emotional processing for healing. Moving through all four is the actual path out.
Nicotine creates a uniquely alert-and-calm state ideal for learning — but only at low doses used occasionally. If you're using 3–6 mg pouches multiple times a day, you're not getting a cognitive enhancement, you're just rescuing yourself from withdrawal. For a genuine performance effect, use it once or twice per week at most.
Two injections of BPC-157 (100–200 mcg) eliminated shoulder pain Huberman couldn't shift for months. The peptide pinealon gave him 2.5–3 hours of REM sleep inside 6 hours — an effect that persisted into subsequent nights and scaled down to just once per week. Neither is in the book because the human data aren't there yet, but the animal evidence is strong.
Long, slow cardio builds capillary networks and mitochondrial richness; high-intensity intervals push VO2 max. You don't need huge volumes of either. Huberman's protocol: one 45–60 minute long slow session, one near-maximal effort HIIT session (Airdyne 20-on/10-off for 6–8 rounds), and one medium 30-minute effort per week. That's the complete cardio picture.
We use essential and analytics cookies to run Vuci. To understand how the site is used: Privacy Policy.
Install Vuci on your phone
Add it to your home screen for a faster, app-like experience.
Install Vuci on your phone
Tap the Share button, then “Add to Home Screen”.
A new version is available
Reload to get the latest Vuci.