Scientific rationale
- Ketone bodies may partially bypass impaired glucose utilization and may also influence mitochondrial function, oxidative stress, inflammation, and synaptic signalling.
- Interventions studied include ketogenic diets, MCT oil, ketone esters, and other exogenous ketone strategies, each with different adherence and safety profiles.
Research snapshot
- Small clinical trials and reviews report cognitive or functional signals in some participants, but sample sizes, duration, outcome measures, and genetic factors vary.
- The field still needs larger trials that distinguish symptomatic support from disease modification.
Clinical frame
- Older adults with cognitive impairment are vulnerable to weight loss, medication complexity, and nutritional deficiency, so unsupervised restrictive diets can be risky.
- Ketogenic strategies should not be presented as a proven dementia treatment.
Open questions
- Which disease stage, APOE genotype, metabolic profile, or cognitive phenotype is most likely to respond?
- Can benefits be achieved with less restrictive ketone strategies that preserve nutrition and quality of life?
Selected evidence
- Randomized crossover trial of a modified ketogenic diet in Alzheimer's disease Alzheimer's Research & Therapy, 2021
- Medium-chain triglycerides for the symptomatic treatment of dementia-related diseases Journal of Nutrition and Metabolism, 2024
- Consuming a modified Mediterranean ketogenic diet reverses the peripheral lipid signature of Alzheimer's disease in humans Alzheimer's & Dementia, 2025
- Ketogenic approaches for the treatment of Alzheimer's disease Current Opinion in Clinical Nutrition and Metabolic Care, 2024
- The impact of the ketogenic diet on Alzheimer's disease progression Nutrients, 2026
- Medium-chain triglycerides improve cognition and systemic metabolism in mouse models of Alzheimer's disease Molecular Neurodegeneration, 2025