Human Responses to Nutritional Ketosis
Dr. Jeff Volek
Dr. Volek is a registered dietitian and professor in the Department of Human Sciences at The Ohio State University. For the last two decades, he has performed cutting edge research on how humans adapt to ketogenic diets with a dual focus on clinical and performance applications of nutritional ketosis. His scholarly work includes more than 300 peer-reviewed scientific manuscripts and five books, and he has provided more than 200 lectures at scientific and industry conferences around the world.
His team at Ohio State University is currently focused on breaking open new application related to nutritional ketosis. These studies are exploring the role of nutritional ketosis on cardio-metabolic status, ectopic fat accumulation in various tissues, tumor metabolism and health outcomes in various types of cancer, and human physical and cognitive capabilities in military personnel.
Dr. Volek is the Chief Science Officer and Co-Founder of Virta Health, a specialty medical clinic that reverses type 2 diabetes safely and sustainably, without the risks, costs, or side effects of medications or surgery.
Dr. Volek has a Bachelor of Science in dietetics from Michigan State University, and a Master of Science in exercise physiology and Doctorate in kinesiology and nutrition from Pennsylvania State University.
DR. JEFF S. VOLEK (USA) - Professor | Registered Dietitian | Chief Science Officer | The Ohio State University & Virta Health
Ketones are super fuel and longevity metabolites. We are entering the golden age of ketones, where ketosis is proving to be one of the most powerful tools we have to promote health, reverse disease, and expand our health span.
Summary
- Ketones are powerful signaling molecules, not just fuel, that reduce inflammation and oxidative stress by acting as histone deacetylase inhibitors. - Nutritional ketosis can normalize blood sugar and reverse type 2 diabetes, allowing many patients to eliminate medications and achieve significant weight loss. - The brain preferentially uses ketones over glucose, offering therapeutic benefits for epilepsy, Alzheimer’s, and recovery from traumatic brain injuries. - Ketogenic diets may inhibit tumor growth by reducing glucose flux and inflammation, with clinical trials showing potential regression in metastatic breast cancer. - Keto-adaptation allows athletes and soldiers to double their fat-oxidation rates and maintain glycogen levels, enhancing physical endurance and metabolic resilience.
Article
Human Responses To Nutritional Ketosis: Science, Health, And Performance
At Biohacker Summit 2018 Toronto, Dr. Jeff Volek Argued That Ketosis Had Moved From Dietary Fringe To Scientific Frontier
On 15 October 2018, at Biohacker Summit 2018 Toronto in Canada, Dr. Jeff Volek took the stage with a message that challenged decades of nutritional orthodoxy. His presentation, *Human Responses to Nutritional Ketosis*, was not a sermon on fad dieting or a piece of wellness evangelism. It was a densely argued scientific case that ketosis, long dismissed or misunderstood, had emerged as one of the most provocative areas in metabolism research.
Volek, a registered dietitian, professor in the Department of Human Sciences at The Ohio State University, and Chief Science Officer and Co-Founder of Virta Health, spoke with the authority of a researcher who had spent two decades studying how the human body adapted to ketogenic diets. Across more than 300 peer-reviewed papers and hundreds of lectures, he had pursued one central question: what happened when humans shifted from glucose dependence to ketone metabolism?
His answer, delivered before a biohacking audience newly captivated by ketones, was sweeping. Nutritional ketosis, he said, was not merely a weight-loss strategy. It was a deeply conserved human process with implications for diabetes, brain health, cancer research, athletic performance, and even military readiness.
Ketosis As Ancient Biology, Not Modern Hype
Volek began by stripping ketosis of its modern branding and returning it to first principles. Ketosis, he said, was “a highly evolved and conserved process” that existed for one essential reason: to fuel the human brain when glucose was scarce.
Humans store most of their energy as body fat, yet the brain cannot directly use long-chain fatty acids. The liver solves that problem by converting fat into ketones, chiefly beta-hydroxybutyrate and acetoacetate, small enough to cross into the brain and serve as fuel. In this telling, ketosis was less an exotic intervention than an emergency brilliance of human evolution.
“The brain actually prefers ketones over glucose,” Volek said, arguing that ketones could protect against energy crises and enhance cognitive resilience.
The distinction that mattered, he stressed, was not between ketosis and normal metabolism, but between nutritional ketosis and ketoacidosis. Everyone produces ketones at low levels. Restrict carbohydrates sufficiently, usually to under 50 grams a day for most people, and ketone concentrations rise into what he described as a safe, stable, metabolically advantageous range. That state remained far below the dangerous levels seen in diabetic ketoacidosis.
In other words, the body was not malfunctioning in nutritional ketosis. It was adapting.
More Than Fuel: Ketones As Signals
If the old science established ketones as an alternative fuel, the newer science, Volek suggested, had made the subject far more interesting. Beta-hydroxybutyrate was not just burned by tissues. It also acted as a signaling molecule, with effects that resembled hormones.
“Ketones are not just an alternative fuel for the brain; they are signaling molecules with hormone-like effects that promote longevity and overall well-being,” he said.
This was one of the lecture’s central claims. Ketones appeared to reduce inflammation and oxidative stress through several molecular pathways, including histone deacetylase inhibition and suppression of the NLRP3 inflammasome. To a field increasingly interested in aging, inflammation, and chronic disease, those mechanisms mattered.
Volek pointed to animal studies published in *Cell Metabolism* that found ketogenic diets extended lifespan and improved health span, with effects that echoed caloric restriction but without the burden of sustained calorie deprivation. The implication was striking: ketosis might not simply change body composition or blood sugar. It might alter the biochemical atmosphere in which aging unfolded.
The Diabetes Reversal Claim That Cut Through The Noise
For all the intrigue around longevity and molecular signaling, the most forceful part of the talk concerned type 2 diabetes. Here, Volek moved from speculative promise to clinical data.
Through Virta Health, he described a long-term intervention in 262 patients with type 2 diabetes who followed a ketogenic diet alongside a remote care model. The outcomes, he argued, upended one of modern medicine’s grimmest assumptions.
“Type two diabetes does not have to be a chronic progressive disease,” he said. “With the right nutritional approach, we can normalize health markers and reverse the condition.”
In the trial, hemoglobin A1c levels were normalized while many participants reduced or eliminated diabetes medications. Weight loss was substantial. Retention after one year stood at 83 per cent, an important fact in a field littered with short-lived interventions and abandoned resolutions.
What made the case difficult to ignore was its biological coherence. If type 2 diabetes was fundamentally a disorder of carbohydrate intolerance and insulin resistance, then lowering the carbohydrate burden would not be an ideological flourish. It would be a direct treatment of the metabolic problem itself.
Volek framed this not as a miracle, but as an overdue correction. For decades, he implied, medicine had tried to manage carbohydrate intolerance while continuing to prescribe carbohydrate-heavy diets. The contradiction had become so routine that it barely registered.
Weight Loss, Inflammation, And The Saturated Fat Heresy
The lecture also revisited one of the most contested territories in nutrition: fat, particularly saturated fat. Volek argued that the story was more dynamic than public health messaging had allowed. On a well-formulated ketogenic diet, people often consumed more saturated fat, yet circulating saturated fat levels in the blood could decline because the body rapidly oxidized those fats for energy rather than storing them.
That claim, while still unsettling to many mainstream ears, sat within a larger argument about metabolic context. Fats, Volek suggested, could not be understood in isolation from insulin, carbohydrate intake, and fuel partitioning.
He described ketogenic diets as superior to low-fat diets for weight loss in meta-analyses and clinical trials, especially among those with metabolic syndrome or prediabetes. Participants often ate to satiety rather than by strict calorie prescription, yet spontaneously reduced intake. Markers tied to insulin resistance, inflammation, dyslipidemia, and glucose control tended to improve.
He was careful, however, to distinguish a ketogenic diet from a caricature of indiscriminate meat consumption. A successful version, he said, required moderate protein rather than excess, because too much protein could suppress ketone production. The quality of fat mattered as much as quantity. So did replacing starch-heavy foods with non-starchy vegetables and finding an individual level of carbohydrate tolerance that preserved metabolic health.
Cancer Research At The Edge Of Possibility
If diabetes was the established clinical beachhead, cancer was the frontier. Volek spoke cautiously but with unmistakable excitement about ongoing work at Ohio State involving patients with stage four metastatic breast cancer.
The rationale was as compelling as it was sobering. Many tumors are heavily reliant on glucose and glycolysis. Lower glucose flux through carbohydrate restriction, reduce inflammation, and perhaps, he suggested, one might create a metabolic environment less hospitable to cancer growth while nourishing the rest of the body.
The human evidence remained early. Volek acknowledged that much of the literature was still preclinical or based on small studies and case reports. Yet the trial he described had yielded suggestive results. Some patients had shown measurable regression in tumors, including liver metastases seen on sophisticated PET-CT imaging.
He quoted one participant who said the diet had changed her health beyond any possible effect on cancer alone, and that her most recent scan showed liver metastases that had regressed and were nearly undetectable.
This was not proof of cure, and Volek did not present it as such. But it was enough to give the room a glimpse of what an emerging field can feel like in real time: uncertain, fragile, and electric.
The Brain On Ketones
Neurological disease formed another major arc of the presentation. Here again, ketosis occupied a peculiar place in medicine, simultaneously old and new. Its role in epilepsy was long established, with ketogenic diets used for nearly a century to reduce or eliminate otherwise intractable seizures. But Volek argued that the implications stretched well beyond epilepsy.
Because ketone uptake in the brain remained intact even when glucose metabolism was impaired, conditions such as Alzheimer’s disease became especially intriguing targets. Volek described Alzheimer’s as, in part, a metabolic disease marked by diminished glucose uptake in the brain. Ketones, by contrast, could still be taken up and used, potentially narrowing the brain’s energy deficit.
He pointed to growing evidence that moderate ketosis might improve clinical outcomes in neurodegenerative disease, and suggested similar promise for traumatic brain injury. That had particular resonance for military research, where brain injury, depression, and impaired cognitive resilience remain serious concerns.
The idea was simple but profound. If the injured or degenerating brain struggled to use glucose, ketones might offer not just backup fuel, but a form of metabolic rescue.
Athletes, Soldiers, And The End Of Carbohydrate Dogma
For elite performers, Volek’s message was almost rebellious. Endurance sport had long been built on carbohydrate loading, gels, drinks, and the ever-present fear of bonking. Yet his data suggested that keto-adapted athletes could achieve something once thought physiologically impossible: far higher rates of fat oxidation without sacrificing glycogen stores.
“Athletes are shattering the fat-burning ceiling,” Volek said, “proving that carbohydrates are an optional nutrient rather than an obligate one for high-level performance.”
He drew on findings from the FASTER study, which compared elite endurance athletes habitually eating either high-carbohydrate or ketogenic diets. The keto-adapted athletes burned fat at rates roughly double those of their high-carb peers, reaching levels previously unseen in the literature. Even more surprising, their muscle glycogen levels remained comparable.
That result hinted at a deeper adaptation, one in which the body conserved glucose and glycogen while deriving the overwhelming majority of exercise fuel from fat. For ultra-endurance athletes, this promised liberation from the constant need to refuel. For soldiers, it suggested something broader: metabolic resilience under stress, uncertainty, and prolonged exertion.
The military implications formed a striking coda to the lecture. Volek described obesity and poor fitness as growing threats to military readiness, not only among active personnel but among young people eligible to serve. Ketosis, he suggested, might improve body composition, endurance, cognitive stability, and even protection against hypoglycemia or mild traumatic brain injury.
It was a reminder that metabolism was never just personal. It was also institutional, national, and political.
A Golden Age For Ketone Science
Throughout the talk at Biohacker Summit 2018 Toronto, Volek returned to one theme: ketones had been misunderstood for too long. Once treated as toxic byproducts of a body gone wrong, they were increasingly being recast as “super fuel” and “longevity metabolites,” compounds with the power to reshape how scientists thought about chronic disease and human performance.
“Ketosis is a highly evolved and conserved process that fundamentally serves as a way for humans to fuel their brains efficiently,” he said.
The power of the presentation lay not in certainty but in momentum. Some areas, such as diabetes reversal and seizure control, were backed by strong clinical evidence. Others, like cancer therapy, Alzheimer’s treatment, and military neuroprotection, remained works in progress. But taken together, they suggested a field that was no longer marginal.
What Volek offered in Toronto was not a final verdict on nutritional ketosis. It was something more interesting: a portrait of a scientific landscape in motion, where old fears were giving way to new mechanisms, and where the body’s ancient fasting biology was being rediscovered as a tool for modern disease.
By the end, ketosis no longer sounded like a niche metabolic trick. In Volek’s hands, it had become a language for talking about fuel, inflammation, adaptation, and survival itself.
Part of Biohacker Summit 2018 Toronto