Snapshot · The Diary Of A CEO with Steven Bartlett
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.'
Where this was said
At 50:17 · 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.
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.
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.
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