Quick answer: The ketogenic diet has been used under medical supervision for epilepsy for about a century. Research suggests ketones may support the brain by providing efficient fuel, supporting mitochondria, lowering oxidative stress and inflammation, raising neurotrophic factors like BDNF, and balancing glutamate and GABA. Evidence for Alzheimer’s, Parkinson’s and mood conditions is early.
Key takeaways
Ketones are an efficient fuel for the brain and may support mitochondrial function, although much of this research comes from animal and small human studies.
The strongest evidence is in epilepsy, where medically supervised ketogenic diets are an established option for some drug-resistant cases.
Brain energy, inflammation and oxidative stress all shift with age, so sleep, exercise and blood sugar balance matter alongside diet.
How keto may protect the brain
Much of this research comes from animal and small human studies.
Mitochondrial function
Ketones are an efficient brain fuel and may support mitochondria. See MCT oil and mitochondria.
Lower oxidative stress
Keto may boost antioxidant enzymes and reduce reactive oxygen species.
Neurotrophic factors
Research suggests keto may raise BDNF, which supports nerve cell growth and plasticity.
Less neuroinflammation
Keto may lower pro-inflammatory cytokines in the brain.
Balanced excitability
Keto may shift the balance of glutamate and GABA, calming overexcited nerve cells.
Areas being studied
Epilepsy
The strongest evidence: medically supervised ketogenic diets are an established therapy for some drug-resistant epilepsy. This must be done with a neurology team.
Cognitive health
Brain glucose use declines in some people with age and Alzheimer’s. Ketones and MCTs are being studied as alternative fuels; results are early.
Mood
Early research is exploring effects on neurotransmitters and mood. Never change psychiatric medications without your prescriber.
Healthy aging lens
Brain energy, inflammation and oxidative stress all change with age. Sleep, exercise and blood sugar balance also matter. See brain waste clearance.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if you have diabetes or take insulin, sulfonylureas or SGLT2 inhibitors (risk of low blood sugar or ketoacidosis), or if you take blood pressure medication or diuretics. The same is true if you have kidney, liver, gallbladder or pancreas disease, or high cholesterol, if you are pregnant, breastfeeding, or have a history of disordered eating, or if you want a keto plan tailored to your labs and goals.
See a medical provider promptly for nausea and vomiting, abdominal pain, confusion, fruity-smelling breath with rapid breathing, or very high blood sugar or ketone readings, which can signal ketoacidosis.
What the research shows
Epilepsy is where the evidence is strongest. In a 2008 randomized trial by Neal and colleagues, 145 children with drug-resistant epilepsy were assigned to a ketogenic diet or usual care for 3 months. Seizures fell to 62% of baseline on the diet compared with 137% in controls, and 38% of the diet group had more than a 50% reduction versus 6% of controls. Many children did not complete the trial, and this diet must be supervised by a neurology team.
For memory and thinking, the data are early. In a 2019 randomized trial by Fortier and colleagues, 52 adults with mild cognitive impairment took 30 grams a day of a ketogenic medium-chain triglyceride drink or a placebo for 6 months. Brain ketone use rose by 230%, and several memory, language and processing-speed measures improved compared with baseline. Only 75% finished, and the cognitive gains were measured against baseline rather than against placebo, so larger trials are needed.
Want a keto plan that’s safe for your health?
A free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Questions to bring to your clinician
These questions can help you get the most out of your next visit.
Could a ketogenic approach be appropriate for my brain or mood concerns, and would it need supervision?
Could keto affect my mood or mental clarity, positively or negatively?
Is keto appropriate for my neurological or mood concerns?
How should I track my focus and mood while I try keto?
Frequently asked questions
Does keto help epilepsy?
Medically supervised keto diets are an established therapy for some drug-resistant epilepsy.
Can keto prevent Alzheimer’s?
There’s no proof; research is early.
Does keto improve mood?
Some people report it, but evidence is limited.
What is BDNF?
A protein that supports nerve cell growth and plasticity.
Sources
- Neal EG, Chaffe H, Schwartz RH, et al. The ketogenic diet for the treatment of childhood epilepsy: a randomised controlled trial. Lancet Neurol 2008. PMID: 18456557. https://pubmed.ncbi.nlm.nih.gov/18456557/
- Fortier M, Castellano CA, Croteau E, et al. A ketogenic drink improves brain energy and some measures of cognition in mild cognitive impairment. Alzheimers Dement 2019. PMID: 31027873. https://pubmed.ncbi.nlm.nih.gov/31027873/
- Gano LB, Patel M, Rho JM. Ketogenic diets, mitochondria, and neurological diseases. J Lipid Res 2014. PMID: 24847102. https://pmc.ncbi.nlm.nih.gov/articles/PMC4617125/
- Milder J, Patel M. Modulation of oxidative stress and mitochondrial function by the ketogenic diet. Epilepsy Res 2012. PMID: 22078747. https://pmc.ncbi.nlm.nih.gov/articles/PMC3322307/
- Yudkoff M, et al. The ketogenic diet and brain metabolism of amino acids: relationship to the anticonvulsant effect. Annu Rev Nutr 2007. PMID: 17444813. https://pmc.ncbi.nlm.nih.gov/articles/PMC4237068/
- Martin-McGill KJ, et al. Ketogenic diets for drug-resistant epilepsy. Cochrane Database Syst Rev 2020. PMID: 32588435. https://pmc.ncbi.nlm.nih.gov/articles/PMC7387249/
- Cunnane SC, et al. Brain energy rescue: an emerging therapeutic concept for neurodegenerative disorders of ageing. Nat Rev Drug Discov 2020. PMID: 32709961. https://pmc.ncbi.nlm.nih.gov/articles/PMC7948516/
- MedlinePlus: Epilepsy
- MedlinePlus: Alzheimer’s Disease
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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