Ketogenic diet and mental health: the mitochondria link

When Andrew Huberman sat down with Dr. Chris Palmer, a Harvard psychiatrist, the conversation started with Palmer's own body. In his 20s, during his training, he was diagnosed with metabolic syndrome, high blood pressure, poor lipids and prediabetes, despite following a low fat diet and exercising. Year after year it got worse, until his doctor told him to expect three medications for life. As a last try before pills, he tested the Atkins diet. Within three months the metabolic syndrome was gone. The surprise was not the lab work. It was that his mood, energy, concentration and sleep improved so much that he woke up rested before his alarm for the first time in his life.

From a personal fix to a psychiatric tool

Palmer ran a tertiary clinic full of treatment resistant patients, people who had seen six or more psychiatrists, tried dozens of medications and spent decades in therapy. He began offering low carbohydrate and ketogenic diets. Some had a powerful antidepressant response. One woman, chronically depressed and suicidal for more than five years, became hypomanic within a month.

The case that changed his mind came in 2016. A 33 year old man with schizoaffective disorder had been his patient for eight years, with daily auditory hallucinations, paranoid delusions, a weight of 340 pounds and 17 failed medications. He started keto to lose weight for personal reasons. Within two weeks Palmer saw an antidepressant effect. At six to eight weeks the man reported that the voices were fading and that his lifelong delusions no longer felt true. He eventually lost about 150 pounds, performed improv in front of an audience and moved out to live independently. Palmer is blunt that tapering psychiatric medication is difficult and dangerous and has to be supervised.

Ketosis seems to be the switch

Palmer noticed that patients who tried the diet but never reached ketosis usually got no clinical benefit. He also does not think everyone needs full keto. For some, simply removing sugar and junk food shifts a mood disorder. The worst foods are ultra processed products that are high in sugar and fat at the same time. For depression he aims for blood ketones above roughly 0.8 mmol/L. For psychotic disorders and bipolar disorder he wants levels above 1.5.

A 100 year old epilepsy treatment

The ketogenic diet was created in 1921 by Dr. Russell Wilder at the Mayo Clinic for one purpose, to mimic fasting and stop seizures long term. Fasting had been observed to halt seizures since the time of Hippocrates, but no one can fast indefinitely. Early results with the diet were striking: about half of patients became seizure free and another 35 percent had a 50 percent or greater reduction, roughly 85 percent efficacy. Anticonvulsant drugs arrived in the 1950s and helped many people, yet about 30 percent of epilepsy is still drug resistant. Johns Hopkins revived the diet in the 1970s for those cases, and about one third become seizure free, one third improve substantially and one third do not respond. That long history gave researchers decades of neuroscience on what the diet does: it shifts glutamate, GABA and adenosine, changes calcium channel regulation and gene expression, lowers brain inflammation, alters the gut microbiome and improves insulin signaling.

The mitochondria mechanism

Palmer's framework centers on mitochondria. They are not just the power cord of the cell, they are closer to the motherboard, allocating resources and directing operations. They supply building blocks and energy for key neurotransmitters including serotonin, dopamine, glutamate and acetylcholine, and they physically move to the synapse to help release neurotransmitter vesicles. Flooding a synapse with ATP after removing its mitochondria does not restore release. Mitochondria also carry the enzyme for making steroid hormones such as cortisol, estrogen, testosterone and progesterone, they help switch inflammation on and off, and they signal the phases of wound healing in immune cells.

The ketogenic diet stimulates two processes: mitophagy, which clears out old and defective mitochondria, and mitochondrial biogenesis, which builds new ones. After months or years on the diet, many cells end up with more mitochondria that work better. Palmer believes this is why the same diet helps both epilepsy and chronic mental illness. Large randomized trials are underway but not yet published.

What about the rest of us

For everyday burnout, subclinical depression and unexplained bad days, Palmer often suggests trying carbohydrate restriction for a while. He describes a reader with chronic anxiety who was about to start medication, cut carbohydrates without going fully ketogenic, and felt dramatically better within three weeks. People with serious disorders, chronic depression, heavy medication loads, disabling symptoms, bipolar disorder or schizophrenia, should do this with a clinician, because medication may need to be adjusted and the diet deserves a real attempt rather than guesswork.

Bottom line

Nutrition belongs among the primary tools for mental health, not as a fringe idea and not as an excuse to stop medication abruptly. The diet's century in epilepsy provides the mechanism: renew the mitochondria, and the systems that drive mood, thought and the stress response get a chance to work properly.