How to Use Ketosis for Enhanced Mood, Cognition, and Long-Term Brain Protection — Dr. Dom D'Agostino

Tim Ferriss, 18 days into strict ketosis, interviews metabolic researcher Dr. Dom D'Agostino about the cognitive, psychiatric, and disease-protective benefits of ketogenic eating. They dig into why Tim's blood ketone readings are surprisingly low despite feeling sharp, attributing it to high ketone utilization and improved insulin sensitivity from intermittent fasting. Dom covers the science of metabolic memory, gluconeogenesis, the glucose-ketone index, and how to use ketosis to delay Alzheimer's and slow glycolytic cancers. A large portion warns about 1,3-butanediol-based exogenous ketones, which can cause liver toxicity, dependence, and alcohol-like intoxication, especially dangerous for older people. The episode closes with practical food, fiber, and supplement recommendations plus Dom's harrowing story of accidental poisoning from contaminated gummies.

• A ketogenic diet quiets the brain by lowering glutamate and elevating GABA, a calming neurotransmitter, which underlies its rapidly expanding use in metabolic psychiatry for depression, bipolar, schizophrenia, anxiety, and anorexia.
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• Lyme disease spirochetes (Borrelia) are essentially 100% glycolytic, so limiting glucose starves the microbe, and elevated beta-hydroxybutyrate stimulates the adaptive immune response, possibly explaining why ketosis resolved Tim's tick-borne cognitive symptoms.
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• Tim's very low blood ketone readings (0.1 to 0.4 mmol) despite feeling sharp are likely a false negative caused by very high ketone utilization and insulin sensitivity, meaning his tissues consume ketones before they show up in the blood.
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• You can get about 80% of the benefits with a low-carb diet (around 100g carbs/day) and periodically, roughly one week per month, drop into deeper ketosis, since higher ketones are not better and a sweet spot of 1 to 2 mmol is therapeutic.
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• 1,3-butanediol and 1,3-butanediol-based ketone esters can cause chronic liver toxicity (depleting NAD and ATP, causing inflammation and fatty liver), and animals showed scary liver damage even when blood liver enzymes stayed normal.
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• 1,3-butanediol is metabolized like ethanol, creates dependence and alcohol-like withdrawal, and is sold as an alcohol replacement, making these supplements dangerous for the elderly dementia population some companies target.
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• On a ketogenic diet, roughly 34 to 40% of the ketone in the heart is L-beta-hydroxybutyrate, which appears to improve cardiac output and increase blood flow to the brain by reducing peripheral vascular resistance.
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• Metabolic memory is real: like muscle memory, the more you stay in ketosis the faster your body re-adapts, driven by increased mitochondrial number and capacity plus epigenetic gene programs.
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• There are 160 or more registered clinical trials on exogenous ketones listed on clinicaltrials.gov.
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• About 80% of cancers are highly glycolytic, and while a ketogenic diet does not cure cancer it can slow tumor growth and augment standard care like radiation and chemo.
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• Tim's staple keto meal is two cans of chub mackerel with about 30ml of MCT oil plus apple cider vinegar, salt, and pepper, costing around three dollars.
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• Breath ketones (acetone) can be a more accurate indicator of ketosis than blood ketones during a caloric deficit, when blood ketone disposal into tissues is very high.
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• A B12 deficiency can cause brain atrophy and present as flat-out Alzheimer's disease, but can be reversed by correcting the deficiency.
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• High-sensitivity C-reactive protein (HSCRP) inflammation is now considered probably more atherogenic than LDL cholesterol.
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• To calculate the glucose-ketone index (GKI), divide blood glucose by ketone level; US glucose readings in mg/dL must first be divided by 18 to convert to mmol/L.
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• The only long-term human data on 1,3-butanediol is a single case report (Mary Newport's husband Steve) and a 28-day study using 25 grams per day.
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• The ketone ester traces back to Dr. Richard Veech, a student of Hans Krebs of the Krebs cycle; the work was funded in part by DARPA and developed at Oxford.
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• Ketones above the 2 to 5 mmol range create energy toxicity and reductive stress, so higher is not better for general therapeutic ketosis.
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