Effect of Exercise, Endocannabinoids and Ketones on Cerebral Metabolism in a Cognitive Disorders Population

Inclusion Criteria: * Alzheimer's or parkinson disease diagnostic * Stable medication associated with the disease * Able to consent * Presence of an accompanying person for the first and last visit. * Ability to read and talk in French Exclusion Criteria: * MMSE \< 20 * MCT or coconut oil supplementation * Coconut allergy * Cannabis, THC or CBD consumption * Excessive alcohol consumption * Physical activity 3x/week * Presence of an metallic object in the body * Impossibility to lay in dorsal decubitus for 40 minutes * Cardiac disease * Any uncontrolled disease that could interfer with the project.