For decades, bipolar disorder has been treated almost exclusively with medication. But a growing body of research — including a landmark pilot trial led by Dr. Iain Campbell — is asking a different question: what if what we eat could meaningfully change how the brain behaves in bipolar disorder?
The answer, based on early findings from the field of metabolic psychiatry, is quietly extraordinary.
The Study: Keto and Bipolar Disorder
Dr. Iain Campbell and his colleagues at the University of Edinburgh ran a pilot randomised controlled trial involving 27 adults with bipolar disorder. Participants followed a ketogenic diet — roughly 60–75% of calories from fat, with carbohydrates restricted to just 5–7% — for 6 to 8 weeks.
The results were measured using MRS (magnetic resonance spectroscopy) neuroimaging, which allowed researchers to directly observe changes in brain chemistry. What they found was striking:
- Reduced brain glutamate levels — a neurotransmitter that, when elevated, is strongly associated with mood instability and excitotoxicity in bipolar disorder
- 91% of participants achieved measurable ketosis, demonstrating that the diet is feasible even in a psychiatric population
- Higher blood ketone levels correlated with better mood, more energy, and reduced impulsivity
This isn’t just a dietary trend — it represents some of the first neuroimaging evidence that a metabolic intervention can alter brain chemistry in a condition as complex as bipolar disorder.
Why Glutamate Matters in Bipolar Disorder
Glutamate is the brain’s primary excitatory neurotransmitter. In healthy brains, it’s balanced by GABA, its inhibitory counterpart. In bipolar disorder, this balance is often disrupted — elevated glutamate activity is thought to contribute to manic episodes, emotional volatility, and cognitive dysregulation.
The ketogenic diet appears to shift this balance. By providing ketone bodies (particularly beta-hydroxybutyrate) as an alternative fuel, the brain may reduce its reliance on glutamate-heavy metabolic pathways. Some researchers believe ketones may also directly enhance GABA synthesis, further calming an overexcited nervous system.
What Is the UKRI Hub for Metabolic Psychiatry?
Dr. Campbell’s work is part of a broader initiative — the UKRI (UK Research and Innovation) Hub for Metabolic Psychiatry, a multi-institution effort studying how metabolic interventions like the ketogenic diet may benefit people with serious mental illness. The Hub currently supports or coordinates more than 20 clinical trials worldwide, covering not just bipolar disorder but also depression, schizophrenia, and treatment-resistant mood disorders.
This is no longer fringe science. It’s funded, peer-reviewed, and neuroimaging-backed.
What EMA (Ecological Momentary Assessment) Revealed
One of the more methodologically interesting aspects of the trial was its use of Ecological Momentary Assessment (EMA) — a smartphone-based tool that collected real-time mood and symptom data from participants throughout the study period. Rather than relying on retrospective recall, EMA captures how people actually feel moment to moment.
The EMA data confirmed what neuroimaging suggested: participants on keto reported meaningful improvements in daily mood stability and energy levels relative to their baseline, and these improvements tracked with their ketone readings.
Should You Try Keto for Bipolar Disorder?
This is where we have to be careful. The research is promising but early. A 27-person pilot trial — however well-designed — is not sufficient evidence to recommend keto as a standalone treatment for bipolar disorder.
What it does suggest:
- The ketogenic diet is biologically plausible as an adjunct treatment
- Larger trials are underway and warranted
- For some people, metabolic factors (blood sugar regulation, mitochondrial function, neuroinflammation) may be playing a significant role in their mood disorder
If you have bipolar disorder and are curious about a ketogenic diet, speak with your psychiatrist or GP first. Keto can interact with some mood stabilisers and requires careful management, particularly around electrolytes and medication levels.
Further Reading
For a deeper dive into the science connecting metabolism and mental health, Dr. Christopher Palmer’s book Brain Energy: A Revolutionary Breakthrough in Understanding Mental Health is essential reading. Palmer, a Harvard psychiatrist, makes the case that many mental illnesses are fundamentally metabolic disorders — and that the ketogenic diet may be one of the most powerful tools we have for treating them.