Ketogenic Diets for Psychiatric Illness: The Point Isn't Weight Loss, It's Mitochondria
Psychiatrist Chris Palmer uses ketogenic and low-carb diets to relieve symptoms in psychiatric patients whom medication has failed; the mechanism is not just weight loss but a change in the brain's energy metabolism and neurotransmitters, driven by mitophagy and mitochondrial biogenesis.
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A strict low-fat year made his metabolic disease worse, not better
During his residency at Harvard, Palmer was diagnosed with metabolic syndrome: high blood pressure, bad lipids, prediabetic. He followed a low-fat diet and exercised strictly, and got worse year after year, until his doctor put him on three medications at once. In a ‘one last try’ frame of mind, he switched to the Atkins diet, and three months later the metabolic syndrome was completely gone. More surprising still, his mood, energy, focus and sleep all improved dramatically, and for the first time he was waking up naturally before his alarm. The experience made him start questioning medical dogma, and drew his attention to how diet affects mental state.
— Chris PalmerOnly the patients who actually reached ketosis got better
Most of Palmer's patients have treatment-resistant psychiatric illness: they have been through six or more psychiatrists, dozens of medications, years of therapy, even electroconvulsive therapy, with nothing working. He brought low-carb diets into the clinic and found that only the patients who entered ketosis showed improvement. In 2016, a 33-year-old man with schizoaffective disorder had daily auditory hallucinations and paranoid delusions, could not leave the house, and had tried 17 medications. Within two weeks of going keto he showed a marked antidepressant effect; after six to eight weeks the hallucinations and delusions began to disappear. He ultimately lost 160 pounds, completed a certificate program and now lives independently.
— Chris PalmerDepression and schizophrenia need different blood ketone levels
Different psychiatric illnesses require different depths of ketosis. For depression, Palmer typically sets the target blood ketone level at ≥0.8 mmol/L; for schizophrenia and bipolar disorder, especially chronic and severe cases, he wants ≥1.5 mmol/L. He also stresses that not every patient needs ketosis; for some, simply cutting out high-sugar, high-fat ultra-processed food is enough. This tiered approach turns dietary intervention from a one-size-fits-all prescription into precision metabolic treatment, and explains why some patients improve just by giving up sugar.
— Chris PalmerThe ketogenic diet was never a weight-loss diet; it was epilepsy therapy
The ketogenic diet is not a weight-loss diet. It was developed in 1921 by a physician specifically to treat epilepsy, building on an observation dating back to ancient Greece that fasting stops seizures. The problem is that fasting cannot be sustained long term, so Russell Wilder tried to mimic the fasting state with a high-fat, low-carbohydrate diet. The early results were striking: 50% of patients became seizure-free, another 35% saw their seizures cut by more than half, for an overall response rate of about 85%. In the 1970s, Johns Hopkins applied the ketogenic diet to treatment-resistant epilepsy: roughly a third of patients became seizure-free and a third showed clinical improvement. This paved the way for its later use in psychiatric illness.
— Chris PalmerMany pathways change, but the one that actually works is mitochondrial
The ketogenic diet has been shown to alter levels of neurotransmitters including glutamate, GABA and adenosine, to modulate calcium channels and gene expression, to reduce brain inflammation, to change the gut microbiome, and to improve insulin signaling. But Palmer believes the crucial one is mitochondria: ketosis stimulates both mitophagy and mitochondrial biogenesis, the first clearing out aged or defective mitochondria, the second generating new healthy ones. He believes this is the underlying reason the ketogenic diet works for both epilepsy and chronic psychiatric illness, and it gives mechanistic research a target.
— Chris PalmerMitochondria are not the power cord, they are the cell's motherboard
Palmer offers a counterintuitive analogy: mitochondria are not just the power cord supplying the cell with electricity, they are the motherboard that allocates resources. They participate directly in the production and release of core neurotransmitters including serotonin, dopamine, glutamate and acetylcholine. Experiments have even found that once mitochondria are removed from a synapse, neurotransmitters cannot be released even when large amounts of ATP are pumped in. Mitochondria also contain the enzymes that synthesize steroid hormones such as cortisol, estrogen, testosterone and progesterone, and they regulate inflammatory switches. Mitochondrial dysfunction can therefore string together several of the known threads in psychiatric illness.
— Chris PalmerMitochondrial dysfunction may be the unifying cause of aging
Mitophagy is a specialized branch of autophagy that identifies and clears defective mitochondria specifically. Fasting, caloric restriction and fasting-mimicking diets all stimulate this process strongly, which is one of the leading current explanations in medicine for why caloric restriction extends lifespan. Palmer cites David Sinclair's claim that mitochondrial dysfunction may be the unifying cause of aging and of all aging-related diseases. So mitophagy is not just a metabolic topic; it may be the key bridge to understanding the mechanisms that psychiatric illness and aging share.
— Chris PalmerIf you have no diagnosis, cut carbs first, don't jump straight to keto
For people with no psychiatric diagnosis who feel fatigued and low, Palmer suggests trying short-term carbohydrate restriction first, rather than going straight to a ketogenic diet. He gives an example: a vegetarian who read his book cut back on high-carbohydrate foods on their own, and within three weeks their anxiety eased significantly and they no longer needed prescription medication. But he warns explicitly that patients with serious disorders such as bipolar disorder or schizophrenia must not try this on their own, and must adjust medications under a doctor's supervision, because the metabolic changes the diet causes will affect drug dosing, and stopping medication on your own is extremely dangerous.
— Chris PalmerIn their own words · checked verbatim
The thing that upended everything that I knew as a psychiatrist was 6 to 8 weeks in. He spontaneously starts reporting, You know, those voices that I hear a ll the time. They're going away.
Chris Palmer10:27
The ketogenic diet unbeknownst to most people was actually developed 100 years ago,1921, by a physician for one and only one purpose to treat epilepsy.
Chris Palmer15:57
We know that mitochondria actually have the enzyme required for the synthesis of steroid hormones.
Chris Palmer25:32
Figures
| Time for Palmer to reverse his metabolic syndrome | 3 months | 3:32 |
| Target blood ketone level for treating depression | ≥0.8 mmol/L | 13:49 |
| Target blood ketone level for schizophrenia / bipolar disorder | ≥1.5 mmol/L | 13:49 |
| Year the ketogenic diet was invented | 1921 | 15:57 |
| Early response rate of the ketogenic diet in epilepsy | 50% seizure-free; 35% with seizures reduced by ≥50%; overall response rate about 85% | 18:20 |
| Share of treatment-resistant epilepsy patients | about 30% | 18:20 |
Glossary
- Mitophagy
- The process by which cells selectively clear out damaged or aged mitochondria and then build new ones.
- Mitochondrial biogenesis
- The process by which cells generate new, healthier mitochondria; a ketogenic diet can stimulate it.
- Ketosis
- A metabolic state in which blood ketone bodies rise and the body shifts from glucose to fat for fuel.
- Schizoaffective disorder
- A psychiatric illness with symptoms of both schizophrenia and a mood disorder.
How to listen
Patients managing treatment-resistant depression or bipolar disorder, psychiatrists, and researchers and founders curious about the mechanisms linking diet to the brain.
The sponsor segments are skippable; non-specialist listeners can skim the mitochondrial mechanism details.