Tim FerrissDr. Dominic D'Agostino on Fasting, Ketosis, and The End of Cancer
CHAPTERS
- 0:00 – 2:40
Cold open: Dom’s ketogenic breakfast (eggs, sardines, oysters)
Tim starts with a quick soundcheck that turns into a snapshot of Dom’s typical breakfast. Dom lists specific foods that set the tone for a nutrition-and-performance-focused conversation.
- •Dom’s breakfast includes eggs, sardines, oysters, and broccoli
- •Tim jokes about blending it all together
- •Sets an immediate “real food” ketogenic context before the formal intro
- 2:40 – 8:49
Dom’s background, research focus, and the 7-day fast + heavy deadlift story
Tim introduces Dom’s professional roles and why he’s a go-to resource on ketosis, fasting, and strength. Dom recounts a seven-day fast that ended with very high-performance lifting, and explains what drew him into fasting research.
- •Dom describes his work as nutritional neuroscience and metabolic regulation
- •He recounts fasting seven days and then deadlifting 500 lbs for 10 reps and a 585-lb single
- •He references George Cahill’s long fasting research as inspiration
- •Dom explains he began serious work in this area around 2009–2010
- 8:49 – 12:12
Research approvals and constraints: IRBs, IACUC, and why studies get blocked
The conversation shifts to how studies get approved (or rejected) and how institutional rules shape what research can happen. Dom contrasts fast approvals at one institution with repeated rejections elsewhere, and also explains restrictions in animal studies.
- •Definition and purpose of the Institutional Review Board (IRB)
- •Dom describes variability between IRBs and delays for “first-in-human” studies
- •He compares human IRB processes to animal oversight via IACUC
- •He notes strict limits around animal fasting/calorie restriction and weight loss thresholds
- 12:12 – 20:48
Ketogenic diet in advanced lifters: study design, outcomes, and insulin questions
Dom summarizes a controlled study in resistance-trained subjects comparing a Western diet with a ketogenic diet. He explains how strength, hypertrophy, and body composition changed, and addresses concerns about muscle gain with lower insulin spikes.
- •Study involved 12 advanced resistance-trained subjects and tightly controlled training in a lab
- •Ketogenic group restricted carbs to ~20–25 g/day and used added fats including MCT/coconut oil
- •Strength and performance were maintained or increased; muscle hypertrophy was observed
- •Body composition shifted more favorably in the ketogenic group (similar lean gain with more fat loss)
- •Dom discusses insulin sensitivity, anti-catabolic effects of ketones, and why protein level matters (modified Atkins vs classical keto)
- 20:48 – 24:20
What ketosis is: ketones, fasting physiology, and the clinical threshold
Dom defines ketosis by walking through what happens metabolically during fasting and carbohydrate restriction. He explains what ketone bodies are, why the brain drives part of this shift, and what ketone levels typically mark “being in ketosis.”
- •Fasting depletes liver glycogen, suppresses insulin, and increases fatty acid mobilization
- •The liver converts fatty acid oxidation products into ketone bodies that can cross the blood-brain barrier
- •Clinical definition cited: ketosis begins around 0.5 mM blood ketones
- •Fasting is described as the fastest way to induce ketosis; ketogenic diets mimic fasting physiology
- •Dom notes beta-hydroxybutyrate is a primary circulating ketone but is converted for energy use
- 24:20 – 28:01
Ketones beyond fuel: gene expression, antioxidants, and anti-inflammatory signaling
Dom describes ketones as more than an energy metabolite, highlighting signaling effects that influence gene expression and inflammation. He references research on beta-hydroxybutyrate as an HDAC inhibitor and discusses anti-inflammatory pathway effects seen in published work.
- •Beta-hydroxybutyrate described as a class I and II HDAC inhibitor
- •Dom mentions upregulation of endogenous antioxidant mechanisms (including superoxide dismutase and catalase)
- •He discusses anti-inflammatory effects, including inhibiting an inflammasome linked to chronic diseases
- •He emphasizes some anti-inflammatory effects appear independent of metabolism itself
- •Tim and Dom clarify endogenous vs exogenous ketones
- 28:01 – 30:49
Fasting, chemo tolerance, and neurodegeneration: where ketosis may help (and cautions)
Tim asks about fasting around chemotherapy and the potential protective effects observed anecdotally. Dom explains the rationale for fasting/ketosis in that context and then addresses implications for neurodegenerative disease prevention, while emphasizing supervision and patient context.
- •Dom says fasting before chemotherapy may sensitize tumors while increasing healthy-cell resistance to toxicity
- •He stresses caution for patients with severe muscle wasting and emphasizes supervision
- •Tim asks about Alzheimer’s/Parkinson’s family history; Dom addresses potential relevance of ketosis
- •Dom frames fasting/ketosis as a tool whose appropriateness depends on the individual (e.g., BMI and condition)
- 30:49 – 34:50
Cachexia and sarcopenia: the muscle-wasting “perfect storm” in cancer
Dom defines cancer cachexia and distinguishes it from age-related sarcopenia. He outlines how cancer, chemotherapy, inflammation, and inactivity combine to rapidly degrade lean mass and function, and explains why preserving strength and mobility matters for outcomes and psychology.
- •Cachexia described as inflammatory-factor-driven catabolism of lean body mass in cancer
- •Dom distinguishes age-related sarcopenia from cancer cachexia and chemo-induced wasting
- •He emphasizes how immobilization compounds muscle loss and accelerates decline
- •Dom describes lab interest in ketosis, BCAA formulas, exercise protocols, and potential drugs to mitigate wasting
- •He notes the problem is under-studied and tightly connected to mortality and quality of life
- 34:50 – 43:03
Anabolic agents and SARMs in cancer wasting: potential, dosing concerns, and tradeoffs
Tim asks about anabolic agents in cancer patients and how that intersects with longevity/cancer concerns around IGF-1. Dom discusses what he’s seen in the literature regarding anabolic steroids, introduces SARMs as a cachexia-focused drug class, and explains why androgenic side effects matter.
- •Dom says literature suggests anabolic steroids at certain dosing levels do not promote cancer growth/spread
- •SARMs are described as selective androgen receptor modulators designed to reduce androgenic side effects
- •Dom notes SARMs were developed with cancer cachexia in mind but may be less anabolic than hoped in real-world use
- •He discusses how higher testosterone dosing can raise systemic IGF-1, while lower ranges may not
- •Tim clarifies anabolic vs androgenic effects and why minimizing androgenic effects is important, especially for women
- 43:03 – 54:49
Using exogenous ketones to mimic fasting: glucose effects, dosing logic, and “smoother” transitions
Dom explains how exogenous ketones can create an artificial ketosis that overlaps with some fasting effects, including reductions in blood glucose. He discusses whether exogenous ketones accelerate adaptation, why they may reduce the “glucose withdrawal” period, and what ketone ranges he considers typical vs unusually high.
- •Exogenous ketones described as an energy-containing substance that can induce ketosis without fasting/carbohydrate restriction
- •Dom reports dose-dependent blood glucose reductions, likely linked to hepatic glucose output
- •He explains how ketones may reduce early fasting stress responses (cortisol/sympathetic activation) by supporting brain fuel needs
- •Dom frames mild/moderate ketosis as roughly 1–3 mM and notes higher levels (around 5–6 mM) can produce mild metabolic acidosis requiring renal compensation
- •Tim asks whether exogenous ketones truly speed induction versus merely spiking readings; Dom argues there are meaningful “transition” benefits
- 54:49 – 1:16:09
Ketone esters and military performance: oxygen toxicity resistance, diving, and breath-hold effects
Dom defines ketone esters and describes why they were developed, emphasizing predictable pharmacokinetics and potency. He explains his lab’s diving-related model (oxygen toxicity seizures) and reports large protective effects in animals, then connects this work to observations in humans (including improved breath-hold while fasting).
- •Ketone esters explained as ketones chemically attached via an ester bond to enable oral delivery and controlled release
- •Dom describes rapid induction of high ketone levels after a bolus dose in animal models
- •He explains the military context: closed-circuit oxygen rebreathers and oxygen-toxicity seizure risk
- •Dom recounts dramatic seizure-resistance improvements in his experiments relative to controls
- •He discusses personal and anecdotal breath-hold improvements during fasting ketosis and touches on adaptation via upregulated ketone transport mechanisms
- 1:16:09 – 1:25:08
Travel keto in the real world: Italy carbs, ketone supplements, and Dom’s “ketogenic breakfast” routine
Dom explains why he travels with ketone-support tools even when he won’t eat strictly ketogenic food. He lays out a practical routine involving MCT powder, KetoCaNa, and a ketogenic breakfast, including his reasons for emphasizing specific foods like sardines and oysters.
- •Dom describes using MCT powder and KetoCaNa to bump ketones (often first thing in the morning)
- •He explains powdered MCT improves tolerability compared to MCT oil and can help sustain higher ketone levels
- •Dom details a typical breakfast: eggs, fish (often sardines), oysters, and green vegetables
- •He describes using coffee with butter and MCT powder to keep breakfast highly ketogenic
- •He notes he can stay in meaningful ketosis even while traveling and eating “low carb but not keto” meals
- 1:25:08 – 1:35:41
BCAAs, glutamine, and cancer metabolism: why Dom modified a popular formula
Tim asks about Dom’s BCAA use and Dom explains his collaboration with a supplement company that supported his cancer research. He explains why glutamine can be a concern in certain cancer-metabolism contexts and describes early findings combining ketogenic diets with BCAA supplementation in animal cancer models.
- •Dom names SciVation Xtend as his BCAA product and notes research support tied to his cancer program
- •He explains cancer metabolism concepts: heavy glucose use (Warburg effect) and glutamine use (glutaminolysis)
- •Dom removed glutamine from the formula for study purposes, describing it as an “erring on the side of caution” choice
- •He describes animal work suggesting ketogenic diet improved survival and BCAAs helped weight maintenance, with trends toward added benefit
- •He addresses concerns about leucine/mTOR and argues effects may be more specific to skeletal muscle than tumor growth in their observations
- 1:35:41 – 2:02:05
Metformin, cancer models, and what Dom would do if he had aggressive cancer
Dom discusses metformin as a widely used drug with debated mechanisms and shares his own self-experiment results. Tim then asks what Dom would personally do if diagnosed with an aggressive cancer, and Dom outlines a multi-part strategy centered on ketogenic eating, intermittent fasting, ketone supplementation, and metabolic drugs (including DCA), while still acknowledging standard-of-care where appropriate.
- •Dom describes metformin’s safety profile and debate over how it works (AMPK, mitochondrial effects, hepatic glucose output)
- •He shares a self-experiment: some biomarkers improved, but he observed lowered testosterone at his dose and later normalization off the drug
- •Dom reports animal-model survival increases with metformin in a metastatic model derived from a glioblastoma-confirmed tumor source
- •For an aggressive scenario (e.g., glioblastoma), he describes a base ketogenic diet with attention to food sources plus intermittent fasting (potentially one meal a day)
- •He adds targeted ketosis elevation via exogenous ketones, titrated metformin dosing, and discusses DCA (dichloroacetate), including concerns like peripheral neuropathy at higher dosing
- 2:02:05 – 2:14:38
Therapeutic fasting: “minimum effective dose,” common pitfalls, and exogenous ketones as a bridge
Tim asks about how often and how long to fast for potential preventive benefits, and shares hard fasting experiences like insomnia and back pain. Dom explains common early fasting stress responses and suggests how exogenous ketones could make transitions smoother, then offers his view on practical fasting frequency/duration and how fasting may relate to immune surveillance of pre-cancerous cells.
- •Dom describes early fasting side effects: sympathetic activation, insomnia, tachycardia, headaches, dizziness, sodium loss, and hypotension risk
- •He suggests exogenous ketones could help people “cruise through” the toughest early days of fasting
- •Dom proposes a schedule for “hardcore” fasting such as five to seven days roughly once per quarter (framed as an ideal if tolerated)
- •He discusses the idea that periodic fasting could help eliminate pre-cancerous cells by creating metabolic stress for glucose/insulin-dependent cancer cells
- •Tim and Dom discuss productivity and reduced food preoccupation as a practical upside of fasting/ketogenic eating
- 2:14:38 – 2:33:59
Exogenous ketone safety and ketone-spiking foods: mineral load, GI limits, fiber, and short-chain fatty acids
Tim asks directly about risks and toxicity of exogenous ketones, especially when combined with higher-carb diets. Dom explains that GI tolerance and mineral load often limit intake before more serious issues arise, describes long-duration rat testing at very high dosing, and then discusses foods/fiber that may influence ketone levels.
- •Dom says GI intolerance often becomes limiting before systemic toxicity at typical use levels, especially for ketone salts
- •He describes a 15-week rat study using very high intake levels (formulated into food) and reports no major abnormalities in clinical chemistry/histology compared to controls
- •He notes that extreme single-bolus dosing of potent esters could cause ketoacidosis in animals, but that’s not reflective of typical use
- •Dom discusses fiber and short-chain fatty acids as potentially ketogenic, referencing artichokes as a plausible example due to high fiber content
- •He explains how fiber and meal composition can reduce amino acid/insulin spikes that might otherwise suppress ketogenesis
- 2:33:59 – 3:06:34
Practical daily diet details, learning resources, gifted books, Lyme disease, and mitochondria wrap-up
Dom and Tim cover Dom’s day-to-day meal pattern (including fat sources and a ketogenic dessert), then shift into recommended resources and frequently gifted books. The conversation closes with Tim’s experience using ketosis after Lyme disease and Dom’s thoughts on neuroinflammation and mitochondrial efficiency in ketosis, followed by contact info and final wrap-up.
- •Dom outlines his typical day: breakfast, coffee with added fats, a large salad-centered dinner, and a keto-style dessert recipe
- •He recommends KetogenicDietResource.com and his site ketonutrition.org as starting points
- •He names books he often recommends or gives, including works by Anthony Robbins, Francis Collins, Thomas Seyfried, and Travis Christofferson
- •Tim describes major improvement after Lyme disease when using ketogenic diet; Dom links potential benefits to anti-inflammatory and brain-homeostasis effects
- •Dom discusses ketones and mitochondria: efficiency, reduced reactive oxygen species generation, and possible support for recovery from mitochondrial stressors
