Podbit · The Diary Of A CEO with Steven Bartlett
The GKI zone chart maps mitochondrial health into colour-coded zones. The green/yellow prevention zone — where Paleolithic man lived — is where cancer and chronic disease are rare. The red zone, defined by high blood sugar and near-zero ketones, is where modern man increasingly lives. A GKI of 12.5 (Steven Bartlett's live reading) already sits in the prevention zone.
Where this was said
At 51:00 · chapter starts 50:04
The abstract becomes concrete as Bartlett pricks his finger live. Blood glucose at 90 mg/dL, ketones at 0.4 mmol/L. [1] — Thomas Seyfried "Steven Bartlett's live GKI measured at 12.5: During the episode, Steven Bartlett measured his blood glucose at 90 mg/dL and ketones at 0.4 …" 50:17 Seyfried does the arithmetic in real time: convert 90 to millimolar (divide by 18 = 5), divide by 0.4, and you get 12.5. That sits comfortably in the yellow-green prevention zone — the metabolic territory where Paleolithic man lived and where cancer and chronic disease are statistically rare. Seyfried notes he got himself down to a GKI of 10 after a week of ribeyes, bacon, eggs, and lamb, though he admits he loved the ribeye a little too much to go lower. The segment demystifies the measurement entirely: a $30 Keto Mojo from Amazon, a finger prick, and a simple division. The new generation of devices does the calculation automatically.
During the episode, Steven Bartlett measured his blood glucose at 90 mg/dL and ketones at 0.4 mmol/L, giving a GKI of 12.5 — placing him in what Seyfried calls the 'prevention zone.'
Seyfried clarified that ketoacidosis — the dangerous pathological condition — occurs at ketone levels of 15–20 millimolar, far above the 0.4 mmol/L representing normal nutritional ketosis.
AI nailed Andrew Huberman's vertigo-vs-low-blood-pressure diagnosis because that pattern has been reported millions of times. But every patient's liver is different and data on liver surgeries is scarce worldwide — making solo robot surgery dangerous. The rule is simple: data abundance means AI can help; data scarcity means keep the human in the loop.
Fei-Fei Li's father had liver surgery performed by a da Vinci robot guided by a surgeon. The result: 10 times less blood loss than a typical procedure. This isn't replacement — it's the gold standard of human-machine collaboration, where the human's judgment and the robot's precision combine.
US drug overdose deaths fell from 110,000 to roughly 70,000 — the biggest CDC-recorded single-year drop ever. Men's rates fell 27% in one year, and the steepest decline of all was among 15–24-year-olds, down 37%. The crisis narrative around young men needs to make room for signs of genuine progress.
Kessler thought his grief expertise would protect him. It didn't. When his son David died unexpectedly, he found himself on the floor — and eventually realized that acceptance alone wasn't enough. That unmet need became the sixth stage: finding meaning.
Grief isn't just death — it's any unwanted change. Kessler lectured at Coca-Cola and General Mills not because they had lots of funerals, but because change management is grief management. People who grieve well live well.
Witnessing someone's grief isn't just emotional support — it's an essential act of healing. Kessler argues grief is a severance and connection heals it. But real witnessing has two steps: seeing the pain AND affirming the person's capacity to recover.
Avoiding grief isn't free — it's exhausting. Kessler's beach ball metaphor nails it: pushing a small balloon down is easy, but holding a massive beach ball underwater takes constant, draining energy. Unattended feelings don't disappear; they just consume you.
Most people try to control their environment to avoid triggers. Kessler flips this entirely: triggers aren't problems to manage around — they're a detailed map to your pain and your healing. Every trigger points directly to what needs attention.
Running from pain doesn't leave it behind — it accelerates the chase. Whatever we run from pursues us, and whatever we face transforms us. Both Kessler and Lewis Howes testify to knowing both roads firsthand.
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