Ketogenic Diet Shows Promise for Bipolar Disorder and Schizophrenia Patients
A first-of-its-kind randomized controlled trial published in July 2026 found that a ketogenic diet improved metabolic markers and showed early signs of reducing symptoms in patients with bipolar disorder and schizophrenia. Researchers say the findings open a new line of inquiry in psychiatric treatment.
A randomized controlled trial published in July 2026 found that a ketogenic diet improved metabolic health and showed early signs of reducing psychiatric symptoms in patients with bipolar disorder and schizophrenia. Researchers called it the first trial of its kind to test the diet in this population under controlled conditions.
The ketogenic diet is a high-fat, very low-carbohydrate eating plan that shifts the body's primary fuel source from glucose to ketones. It has been used for decades to treat epilepsy, particularly in children who do not respond to medication. Researchers have been exploring whether the same metabolic changes might benefit other brain conditions.
In the trial, participants with bipolar disorder or schizophrenia followed a ketogenic diet for 16 weeks while continuing their standard psychiatric medications. The control group maintained their usual diet. Researchers measured metabolic markers including blood sugar, insulin levels, and body weight, as well as psychiatric symptom scores.
The ketogenic group showed significant improvements in metabolic markers. They also showed modest but measurable reductions in psychiatric symptoms compared to the control group. Researchers cautioned that the trial was small and that larger studies are needed before the diet can be recommended as a treatment.
People with serious mental illness have higher rates of metabolic conditions including obesity, diabetes, and cardiovascular disease, partly due to the side effects of psychiatric medications. A dietary intervention that addresses both metabolic and psychiatric health at the same time would be valuable if the results hold up in larger trials.
Nutritional psychiatry is a growing field. Researchers are studying how diet affects brain function, inflammation, and mental health outcomes. The ketogenic diet trial adds to a body of work suggesting that what people eat may influence psychiatric conditions in ways that were not previously understood.
