D'Agostino rejects online claims that a ketogenic diet cures cancer. He says calorie strategy should depend on the patient's weight and presents ketosis as a way to slow highly glycolytic tumors and augment radiation, chemotherapy, or immune-based treatment rather than replace standard care.

Overweight and lighter patients may require different calorie strategies
Ketosis may provide anti-inflammatory, immune, and neuroprotective effects around treatment
D'Agostino says it can slow tumor growth but is not a cancer cure
He frames it as an adjunct to standard care

“it's targeting the tumor growth and putting a break on it, not it's not a cure for cancer.”
Dominic D'Agostino · 14:30

“And it enhances and augments the response to the standard of care, that's radiation, chemo, and immune-based therapies.”
Dominic D'Agostino · 14:30

#cancer#ketosis#standard care#medical caution

Myth Buster27:00

Low Blood Ketones Do Not Always Mean Failed Ketosis

Ferriss describes feeling sharp despite blood and interstitial ketone readings around 0.1 to 0.4 millimolar. D'Agostino explains that blood concentration reflects both production and utilization, so a metabolically fit person in a calorie deficit may clear ketones into tissues rapidly; he also notes that breath acetone may be more informative in that context and that interstitial sensors can lose sensitivity.

Blood ketones reflect production minus tissue utilization
Metabolic fitness and calorie deficit can increase ketone uptake
Breath acetone may remain high when blood BHB looks unexpectedly low
Continuous ketone monitors measure interstitial fluid and may drift over time
Subjective and performance measures can supplement imperfect devices

“So when you measure ketones in the blood, that's a function of ketone production and ketone utilization.”
Dominic D'Agostino · 31:00

“when you're in a caloric deficit, you just have very high ketone disposal uptake into the tissues.”
Dominic D'Agostino · 34:00

#ketone testing#metabolic fitness#breath acetone#wearables

Hot Take· 1

Hot Take1:48:00

Why 1,3-Butanediol May Be Riskier for Older Adults

D'Agostino warns that 1,3-butanediol and related ketone esters can create narcotic-like effects, dependency, withdrawal, and chronic liver concerns. He is especially concerned about older adults with dementia because reduced detoxification capacity, dizziness, and impaired stability may increase fall and injury risk.

1,3-butanediol is metabolized through alcohol-processing pathways
D'Agostino describes published dependency and withdrawal findings
Sedation and dizziness may be pronounced in sensitive users
Older adults may have less capacity to metabolize the compound
The risk profile differs between occasional and chronic use

“13 butane dial can create dependence and it also can create you get withdrawal.”
Dominic D'Agostino · 1:50:30

“for older people, a large dose of 13 butane dial is problematic from a narcotic, from the potential for just getting drunk, just straight up…”
Dominic D'Agostino · 1:55:30

#1,3-butanediol#ketone esters#older adults#supplement safety

Explainer· 3

Explainer02:00

Why Ketosis May Quiet the Brain

D'Agostino says ketosis lowers glutamate and elevates GABA, producing a brain-stabilizing effect already used across multiple seizure disorders. He connects that mechanism to the rapidly expanding field of metabolic psychiatry while distinguishing established seizure applications from broader psychiatric research.

The ketogenic diet has long-standing use across multiple seizure disorders
D'Agostino describes lower glutamate and higher GABA as a calming mechanism
Metabolic psychiatry is exploring depression, bipolar disorder, schizophrenia, anxiety, and anorexia nervosa

“the ketogenic diet just quiets the brain, lowers glutamate and elevates GABA, a brain stabilizing, calming neurotransmitter.”
Dominic D'Agostino · 03:00

“that I think really echoes its broad application for metabolic psychiatry which is everything from major depression to bipolar to schizophrenia to anxiety disorders to…”
Dominic D'Agostino · 03:30

#ketosis#gaba#brain health#metabolic psychiatry

Explainer18:00

The Case for Metabolic Memory

D'Agostino argues that repeated ketosis can make future transitions easier by increasing fat adaptation, fatty-acid oxidation machinery, and mitochondrial capacity. He compares the carryover to muscle memory, while acknowledging that science is still clarifying the duration and magnitude of the effect.

Repeated ketosis may make subsequent ketosis easier
Potential mechanisms include mitochondrial capacity, gene programs, and epigenetic regulation
D'Agostino treats muscle memory as one form of metabolic memory
The precise carryover remains scientifically provisional

“the more you stay in ketosis the easier it gets and the more benefits you derive from it and the more that you shift your…”
Dominic D'Agostino · 19:00

“So the number of mitochondria increase and then when you take a break and then get that stimulation again that mitochondria is kind of there…”
Dominic D'Agostino · 20:00

#metabolic memory#mitochondria#fat adaptation#ketosis

Explainer50:30

Why Protein-and-Vegetable Days Can Lower Ketones

D'Agostino describes periodically replacing very high dietary fat with protein-and-vegetable days to accelerate fat loss and support recovery after heavy training. He says the much higher protein intake lowered his ketones and could push him out of ketosis after two days, but returning to ketogenic eating produced a rapid rebound; he does not present indefinite low-fat ketogenic dieting as viable.

D'Agostino used two protein-and-vegetable days per week during a year-long ketogenic experiment
His protein rose from about 125 grams to about 300 grams on those days
He timed the days after heavy squat or deadlift sessions
Returning to higher-fat ketogenic eating rapidly raised his ketones
The tactic was periodic rather than indefinite

“I would just periodically throw in protein veggie days. I would cruise on keto and then periodically titrate in the protein veggie days to assist…”
Dominic D'Agostino · 53:00

“I would go from like 125 grams of protein to like 300 grams of protein.”
Dominic D'Agostino · 56:30

#body composition#protein#dietary fat#ketosis

Story· 1

Story07:30

Tim's Cognitive Recovery During Lyme Disease

Ferriss recounts severe cognitive and joint symptoms after a second episode of Lyme disease and says strict nutritional ketosis coincided with their disappearance within three or four days. D'Agostino offers two hypotheses—restricting fuel used by the spirochete and enhancing adaptive immunity—but frames further experimental work as necessary.

Ferriss reports slurred speech, memory problems, and severe joint pain
He says the symptoms disappeared after three or four days of strict ketosis
D'Agostino proposes microbial-energy restriction and adaptive-immune stimulation as possible mechanisms
The discussion is anecdotal and mechanistically provisional

“And within 3 or 4 days, effectively, all of my cognitive symptoms disappeared.”
Tim Ferriss · 09:30

#lyme disease#ketosis#immune response#case story

Tool· 2

Tool1:08:30

Use a CGM to Learn Your Personal Food Response

D'Agostino argues that a continuous glucose monitor can reveal which foods and quantities fit an individual's metabolism, even though studies dispute benefits for non-diabetic users. He uses his flat response to lentils as an example and says retrospective reports from people with type 2 diabetes suggest earlier feedback could have changed their behavior.

Food responses differ substantially between people
Time of day and post-meal walking can affect the reading
A CGM can connect specific foods and quantities to glucose response
The value claimed here is awareness and behavior change, not diagnosis

“And I think that's where CGM comes into play. And we can do a personal precision engineered diet, if you will.”
Dominic D'Agostino · 1:09:00

“So, so I think a CGM is going to be important for delaying Alzheimer's disease.”
Dominic D'Agostino · 1:10:00

#cgm#personalized nutrition#glucose#prevention

Tool1:26:00

Build a Cognitive Baseline Before Decline Appears

For someone with Alzheimer's disease in the family, D'Agostino recommends combining physical, dietary, metabolic, supplement, and brain training while establishing objective cognitive baselines. He suggests reaction-time and decision-making tests, repeating the battery roughly every six months, and comparing performance in and out of ketosis.

Establish cognitive measures before obvious decline
Include reaction time and decision-making tasks
Repeat the same battery about every six months
Compare results in the absence and presence of ketosis
Pair cognitive testing with physical and metabolic tracking

“If Alzheimer's was in my family, I would basically be doing everything possible. Physical training, dietary, metabolic training with nutrition, supplementation, and also brain training.”
Dominic D'Agostino · 1:27:00

#cognitive testing#alzheimers#brain training#baseline

Takeaway· 3

Takeaway41:30

Walk Immediately After a Large Meal

D'Agostino recommends walking after a large meal rather than waiting for the glucose peak 60 to 90 minutes later. He says even a short walk activates GLUT4 transporters independently of insulin, increases glucose uptake, and may blunt the later rise.

Start the walk after eating rather than waiting for the measured peak
Ten to twenty minutes can be useful
Walking activates GLUT4 transporters independently of insulin
The response may reduce the insulin needed for glucose disposal

“it's always good to go take a walk after a big meal.”
Dominic D'Agostino · 41:30

“A very short walk can go a long way.”
Dominic D'Agostino · 43:00

#post-meal walk#glucose#glut4#exercise

Takeaway58:00

Brain Protection Starts With Metabolic Health

D'Agostino says metabolic health is tightly linked to brain health and argues for monitoring insulin, glucose, hemoglobin A1C, high-sensitivity C-reactive protein, omega-3 status, B12, magnesium, body composition, and exercise. He stresses that B12 deficiency can resemble Alzheimer's disease and that inflammation and poor metabolic function can accelerate risk, while stopping short of promising prevention.

Assess insulin, glucose, A1C, and high-sensitivity CRP
Check omega-3 status, B12, and magnesium
B12 deficiency can cause brain atrophy and an Alzheimer's-like presentation
Track body composition with DEXA under consistent hydration conditions
Exercise and muscle mass are linked to brain health

“a B12 deficiency will cause brain atrophy. So, and that could be reversed with B12.”
Dominic D'Agostino · 59:30

“your metabolic health is tightly linked to your brain health and can dramatically delay the onset of Alzheimer's disease.”
Dominic D'Agostino · 1:02:00

#alzheimers#biomarkers#metabolic health#brain health

Takeaway1:58:00

Ketosis Can Include Fiber-Rich Whole Foods

D'Agostino says his regular diet includes broccoli, small apples, wild blueberries, walnuts, and other vegetables while he remains in mild ketosis. He estimates 60 to 70 grams of total carbohydrate with roughly one-third from fiber, and says adding carbohydrates back over time helped him maintain lean mass and dietary variety.

D'Agostino favors broccoli, wild blueberries, small apples, and walnuts
He reports eating about 60 to 70 grams of total carbohydrate with substantial fiber
His carbohydrate tolerance reflects his size, muscle mass, activity, and adaptation
He values fiber, phytonutrients, micronutrients, and dietary enjoyment
Individual glucose responses should guide food quantity

“wild blueberries, just green vegetables in general, but I like broccoli and apples are pretty much something I have every day.”
Dominic D'Agostino · 1:59:00

“I've added the more carbs back in over the years and that has helped me maintain my body weight and I just I like eating…”
Dominic D'Agostino · 2:02:30

#fiber#whole foods#carbohydrates#ketogenic diet

Frameworks in this episode

Fat-Fiber-Salt Protein Buffer

Four-Factor Exogenous Ketone Screen

Periodic Ketone Metabolic Therapy Protocol

Insights & moments

⚡Myth Buster· 2

Ketosis Is a Cancer-Therapy Adjunct, Not a Cure