Keto Diet Shows Promise in Mental Health, But Experts Urge Caution
A growing body of research suggests a potential link between dietary interventions, specifically the ketogenic diet, and improved outcomes for individuals with serious mental illnesses like schizophrenia and bipolar disorder. However, a recent statement by US Department of Health and Human Services (HHS) Secretary Robert F. Kennedy, Jr., claiming the diet could “cure” schizophrenia, has drawn criticism from medical professionals who emphasize the need for further investigation and a nuanced understanding of the findings.
The HHS announcement aligns with broader messaging from HHS and the US Department of Agriculture promoting a “eat real food” approach, underscored by recent revisions to federal dietary guidelines that prioritize protein and fats over carbohydrates. According to one official, “We now know that the things that you eat are driving mental illness in this country,” citing preliminary studies indicating dietary changes can impact mental health diagnoses.
Early Research Offers Glimmers of Hope
While a cure remains firmly out of reach, some research offers “very preliminary” evidence supporting the potential benefits of a keto diet for those with schizophrenia and other psychiatric disorders. A pilot study conducted by Stanford University, published in Psychiatry Research in 2024, evaluated the impact of a four-month ketogenic diet intervention on 23 outpatients diagnosed with either schizophrenia or bipolar disorder.
Participants in the study continued their standard psychiatric treatment throughout the trial, allowing for adjustments to medication dosages as needed in consultation with their physicians. The study focused on individuals aged 18 to 75 who were already taking psychotropic medications and met specific criteria related to weight and metabolic health – either a body mass index (BMI) of 25 kg/m2 or higher with weight gain from medication, or at least one metabolic abnormality like insulin resistance.
Significant Improvements Observed in Pilot Study
The results revealed notable improvements in both psychiatric symptoms and metabolic health. Participants with schizophrenia experienced a 32% reduction in scores on the Brief Psychiatric Rating Scale, and an average 31% improvement in Overall Clinical Global Impression (CGI) severity, with 79% of those starting with elevated symptoms showing at least a one-point improvement on the CGI. Beyond symptom reduction, the cohort also reported a 17% increase in life satisfaction and a 19% enhancement in sleep quality.
Importantly, the study also demonstrated positive metabolic changes. By the study’s conclusion, no participants met the criteria for metabolic syndrome. Those who adhered to the keto diet experienced a 12% reduction in weight, BMI, and waist circumference, alongside a 36% decrease in visceral adipose tissue. Biomarker analysis showed a 27% decrease in the Homeostasis Model Assessment of Insulin Resistance and a 25% drop in triglyceride levels.
“This pilot trial underscores the potential advantages of adjunctive ketogenic dietary treatment in individuals grappling with serious mental illness,” the study authors wrote. They emphasized that these effects are not intended to replace prescribed medication, but rather to provide additional benefits to brain health. The authors further noted the need for continued research into the interplay between mental and metabolic health, stating, “Mental health and physical health are interconnected, and addressing metabolic issues can complement psychiatric treatment to enhance overall well-being.”
The Keto Diet: A Primer and Pharmacist’s Role
The keto diet is a high-fat, very low-carbohydrate eating plan that shifts the body’s primary fuel source from glucose to ketones. This metabolic shift can have therapeutic effects for conditions like epilepsy, obesity, type 2 diabetes, and certain metabolic disorders. Originally developed for refractory epilepsy in children, the diet’s growing recognition of its neurological and endocrine effects has led to its broader clinical application.
The diet impacts mitochondrial function, neuronal excitability, and gut microbiota, all contributing to its potential therapeutic benefits. However, the National Library of Medicine notes that healthcare professionals face challenges in patient selection, monitoring, safety, and long-term adherence.
Pharmacists play a crucial role in ensuring patient safety and optimal outcomes on a keto diet. The diet can significantly affect blood sugar, blood pressure, electrolytes, and kidney function, and can also interact with medications. Pharmacists can identify patients at risk for hypoglycemia, particularly those taking insulin, sulfonylureas, or meglitinides. They can also monitor for dehydration and low blood pressure, common early side effects due to fluid and sodium loss, and assess potential risks for patients with pre-existing kidney or heart conditions.
Beyond medication safety, pharmacists can counsel patients on potential nutrient deficiencies, such as low fiber intake and electrolyte imbalances (magnesium, potassium, and sodium), and guide appropriate supplementation. They also serve as a vital resource for combating misinformation, helping patients interpret online advice, avoid unsafe supplements, and recognize warning signs requiring medical attention. Long-term success relies on realistic expectations, managing gastrointestinal side effects, and tailoring the diet to individual lifestyles and medical needs. Collaboration with other healthcare professionals is essential for successful treatment.
While the initial findings are encouraging, it’s crucial to approach the potential of the keto diet as an adjunctive therapy with caution and under the guidance of qualified healthcare professionals. Further research is needed to fully understand the long-term effects and optimal implementation of this dietary approach for individuals with mental illness.
REFERENCES
- Stolberg SG. Kennedy Makes Unfounded Claim That Keto Diet Can ‘Cure’ Schizophrenia. The New York Times. February 5, 2026. Accessed February 9, 2026. https://www.nytimes.com/2026/02/05/us/politics/kennedy-keto-diet-schizophrenia.html?unlocked_article_code=1.KFA.RIbR.A0nyZMjwy9xC&smid=url-share
- Valletti D. New Federal Dietary Guidelines Emphasize Protein and Real Foods While Cutting Sugar. Pharmacy Times. January 8, 2026. Accessed February 9, 2026. https://www.pharmacytimes.com/view/new-federal-dietary-guidelines-emphasize-protein-and-real-foods-while-cutting-sugar
- Daley SF, Masood W, Annamaraju P, Khan Suhed MZ. The Ketogenic Diet: Clinical Applications, Evidence-based Indications, and Implementation. National Library of Medicine – National Center for Biotechnology Information. Updated December 13, 2025. Accessed February 9, 2026. https://www.ncbi.nlm.nih.gov/books/NBK499830/
- Sethi S, Wakeham D, Ketter T, et al. Ketogenic Diet Intervention on Metabolic and Psychiatric Health in Bipolar and Schizophrenia: A Pilot Trial. Psychiatry Res. 2024;335:115866. doi:10.1016/j.psychres.2024.115866
- Impact of a Ketogenic Diet on Metabolic and Psychiatric Health in Patients With Bipolar or Schizophrenia Illness. ClinicalTrials.gov identifier: NCT03935854. Updated December 17, 2024. Accessed February 9, 2026. https://clinicaltrials.gov/study/NCT03935854
- Bai N. Pilot study shows ketogenic diet improves severe mental illness. News release Stanford Medicine. April 1, 2024. Accessed February 9, 2026. https://med.stanford.edu/news/all-news/2024/04/keto-diet-mental-illness.html
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