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Nutritional ketosis has promise for treating Parkinson’s disease. Three previous studies explored the use of a ketogenic diet in cohorts with Parkinson’s disease, and, while not conclusive, the data suggest non-motor symptom benefit. Before the ketogenic diet can be considered as a therapeutic option, it is important to establish with greater certainty that there is a reliable symptomatic benefit: which symptoms or groups of symptoms are impacted (if non-motor symptoms, which ones, and by which mechanism), what timescale is needed to obtain benefit, and how large an effect size can be achieved? To accomplish this, further investigation into the disease mechanisms based on pre-clinical data and hints from the clinical outcomes to date is useful to understand target engagement and gauge which mechanism could lead to a testable hypothesis. We review research pertaining to ketogenic diet, exogenous ketones, fasting, clinical studies, and theoretical review papers regarding therapeutic mechanisms from direct ketone body signaling and indirect metabolic effects. Through discussion of these findings and consideration of whether the ketogenic diet can be regarded as therapeutically useful for adjunctive therapy for Parkinson’s disease, we identify remaining questions for the clinician to consider prior to recommending this diet.   Supplementary Information  The online version contains supplementary material available at 10.1007/s13311-021-01067-w.

Nutritional Ketosis in Parkinson's Disease — a Review of Remaining Questions and Insights