Scientific rationale
- Ketones may influence mitochondrial efficiency, oxidative stress, inflammation, and neuronal signalling relevant to Parkinsonian biology.
- Diet also changes weight, gut function, protein timing, and medication absorption, which can all matter in Parkinson's care.
Research snapshot
- Small randomized and feasibility studies have compared ketogenic approaches with other diets and reported signals in non-motor symptoms or metabolic measures.
- Current evidence is too small and short to establish disease modification or broad clinical recommendations.
Clinical frame
- Constipation, frailty, unintentional weight loss, orthostatic symptoms, and levodopa timing make supervision especially important.
- Dietary changes should be coordinated with the treating neurology team.
Open questions
- Are reported non-motor improvements driven by ketosis, weight change, glycaemic change, microbiome effects, or placebo/context effects?
- Can longer trials measure motor progression, cognition, sleep, autonomic symptoms, and tolerability together?
Selected evidence
- Low-fat versus ketogenic diet in Parkinson's disease: a randomized pilot trial Movement Disorders, 2018
- Ketogenic intervention with MCT supplementation in Parkinson's disease BMC Neurology, 2024
- Randomized safety and feasibility crossover trial of two Mediterranean-ketogenic interventions in Parkinson's disease Frontiers in Nutrition, 2026
- Ketogenic interventions in mild cognitive impairment, Alzheimer's disease, and Parkinson's disease Frontiers in Neurology, 2023
- Impact of a keto diet on symptoms of Parkinson's disease, biomarkers, depression, anxiety and quality of life Neurological Sciences, 2024
- Nutritional ketosis in Parkinson's disease: remaining questions and insights Current Nutrition Reports, 2021