The Brain on Ketones: How Metabolism Could Reshape Treatment for Schizophrenia and Bipolar Disorder
Most conversations about the ketogenic diet and mental health focus on mood. But a 2022 review from Stanford’s Dr. Shebani Sethi and UCSF’s Dr. Judith Ford, published in the Journal of Psychiatry and Brain Science, makes a more ambitious case: that schizophrenia and bipolar disorder may be, at their core, disorders of brain metabolism and that a ketogenic diet could directly target the broken machinery.
Rethinking Serious Mental Illness as a Metabolic Problem
The brain uses roughly 20% of the body’s energy despite being just 2% of its weight, making it extremely sensitive to how efficiently cells produce fuel. Sethi and Ford point to mounting evidence that people with schizophrenia show disrupted insulin signaling and abnormal glucose processing in the brain, even before ever taking antipsychotic medication. That finding is significant because it suggests the metabolic problems aren’t just a side effect of treatment; they may be baked into the illness itself, and they help explain why people with schizophrenia and bipolar disorder face sharply elevated rates of type 2 diabetes and cardiovascular disease.
Why Ketones Might Help
Here’s the key idea: while glucose is the brain’s default fuel, ketone bodies (produced when the body burns fat instead of carbohydrates) may actually be a more efficient energy source, generating more usable energy per molecule. For a brain struggling to use glucose properly, switching fuels could bypass the bottleneck entirely.
The review lays out several ways this might play out biologically: ketones appear to improve mitochondrial function (the cell’s energy-producing machinery), calm neurotransmitter imbalances like the GABA/glutamate system implicated in psychosis, reduce oxidative stress and brain inflammation, and even stabilize the brain’s functional networks. In one striking study cited in the review, just one week of a ketogenic diet was enough to restore youthful patterns of brain network stability in adults; an effect that held up even when ketones were delivered as a supplement rather than through diet alone.
What the Human Evidence Shows So Far
The clinical picture is still early but encouraging. Case reports describe people with schizophrenia experiencing dramatic reductions in hallucinations and delusions within weeks of starting a ketogenic diet, in some cases allowing them to stop antipsychotic medication entirely. A larger retrospective study of 31 psychiatric inpatients found meaningful improvements in both psychiatric symptoms and metabolic health markers like blood pressure and blood sugar. Preliminary data from an ongoing Stanford pilot trial in people with bipolar disorder and schizophrenia showed improvements in quality of life, symptom severity, and metabolic markers like inflammation and visceral fat.
The Catch: Adherence and Evidence Gaps
The authors are upfront that this field still lacks large, controlled clinical trials — most of what exists is case reports, small pilot studies, and animal research. Sticking to a ketogenic diet is also genuinely hard: compliance studies in epilepsy patients show dropout rates as high as 45-50%, often due to intense carbohydrate cravings or difficulty finding suitable foods.
The Takeaway
This review reframes serious mental illness not just as a “brain disease” but as a whole-body metabolic condition which opens the door to nutritional interventions working alongside traditional psychiatric care. The authors are clear that rigorous, controlled trials are still needed before this becomes a mainstream treatment recommendation. But for a field where new therapeutic ideas are rare, “metabolic psychiatry” is generating real scientific momentum.
Source: Sethi, S., & Ford, J.M. (2022). “The Role of Ketogenic Metabolic Therapy on the Brain in Serious Mental Illness: A Review.” Journal of Psychiatry and Brain Science, 7(5), e220009. https://doi.org/10.20900/jpbs.20220009
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About the Author
Stephanie Schabel, PMHNP-BC, is a board-certified Psychiatric Mental Health Nurse Practitioner at SKS Psychiatry specializing in functional and integrative psychiatry. She holds nursing degrees from Texas State University and Gonzaga University, and is a member of Psychiatry Redefined, one of the nation’s leading training programs in functional and integrative psychiatry. Stephanie’s approach combines evidence-based psychiatric care with root-cause, whole-person treatment for depression, anxiety, ADHD, and related conditions.
A Note on Medical Advice
This article summarizes published research for general informational purposes only. It is not medical advice and should not be used to diagnose, treat, or manage any mental health condition. Ketogenic diets can affect medication levels (including mood stabilizers and antipsychotics), blood sugar, and other aspects of health, and are not appropriate for everyone. If you or someone you know is considering dietary changes to help manage a mental health condition, please consult a physician, psychiatrist, or registered dietitian before making any changes.
