Could the Keto Diet Help Treat Bipolar Disorder? Major New Trial Offers Hope
A high-fat, low-carbohydrate ketogenic diet is being investigated as a possible treatment for bipolar disorder in a major new clinical trial in the UK. Researchers hope the study will determine whether changing the way the body produces and uses energy could help people experiencing bipolar depression.
The research follows the personal experience of Scottish researcher Iain Campbell, who discovered an unexpected improvement in his own bipolar depression after adopting a ketogenic-style diet while trying to lose weight. His experience encouraged him to investigate whether the effects could be studied scientifically.
A Major Clinical Trial
The new research programme, costing about £8 million, is expected to recruit around 200 people with bipolar disorder. Participants will be divided into two groups.
One group will follow a ketogenic diet for 12 weeks, while the other will receive standard NHS healthy-eating advice. Importantly, participants will continue taking their usual medications during the trial.
Researchers will assess changes in mood, energy levels and other symptoms. Brain scans will also be used in around half of the participants to investigate whether changes in brain activity or chemistry are associated with improvements.
Why Could Keto Affect the Brain?
Normally, the body relies heavily on glucose, which comes primarily from carbohydrates, for energy. When carbohydrate intake is dramatically reduced, the body begins producing ketones, which can be used as an alternative fuel.
Scientists are interested in whether ketones could influence brain function and metabolism in ways that might benefit people with bipolar disorder.
Some medicines originally developed for epilepsy are also used in bipolar disorder, giving researchers another reason to investigate the possible connection.
Early Research Shows Promise
The new trial is not based solely on anecdotal experiences. Earlier research has produced encouraging preliminary findings.
A small pilot study involving people with bipolar disorder found that a modified ketogenic diet was feasible, with most participants who began the programme completing the intervention. A later analysis found reductions in body weight, body mass index and systolic blood pressure among participants who completed the diet.
Another 2026 randomised controlled trial involving people with schizophrenia-spectrum disorders and bipolar I disorder reported improvements in metabolic health and clinical symptoms among participants following a ketogenic diet. The researchers also found that improvements in depressive symptoms were associated with ketone levels.
However, these findings do not yet establish that keto is an effective treatment for bipolar disorder.
Researchers Urge Caution
Experts involved in the UK trial have stressed that there is currently no solid proof that a ketogenic diet can reliably treat bipolar depression.
Professor Daniel Smith of the University of Edinburgh described the idea as potentially groundbreaking but emphasised that a high-quality randomised controlled trial is needed to determine whether the benefits are genuine and how widely they might apply.
This distinction is important because bipolar disorder is a serious condition that can involve both depressive and manic episodes. People should not stop prescribed medication or make major dietary changes as a replacement for medical treatment without discussing them with their healthcare team.
What the Study Could Mean
If the large trial produces positive results, it could open the door to a new type of treatment that works alongside existing approaches.
The research could also help scientists understand the relationship between metabolism, brain energy and mental health. Even if the diet proves helpful only for a particular group of patients, identifying those people could lead to more personalised treatment strategies.
Conclusion
The growing interest in the keto diet and bipolar disorder reflects a wider effort to understand how nutrition and metabolism may influence brain health. Early studies are encouraging, but they remain insufficient to prove that ketogenic diets can treat bipolar disorder.
The new UK trial could provide much stronger evidence. Until those results are available, the ketogenic diet should be viewed as an area of research rather than an established replacement for conventional bipolar disorder treatment.
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