MediPD: An Online Mediterranean Diet Program for People Living With Parkinson's Disease

Inclusion Criteria: * Self-reported idiopathic Parkinson's disease * Age 18 years or older * Community-dwelling and resident in the United Kingdom * Access to an internet-enabled device and an active email address * Mediterranean Diet Score ≤7/13, indicating low adherence to a Mediterranean diet * Proficient in English * Able to provide informed consent Exclusion Criteria: * Atypical or secondary parkinsonism * Living in an institution * Self-reported body mass index \<18.5 kg/m² * High risk of malnutrition, defined as MUST score ≥2 * Receiving prescribed nutritional support * Significant cognitive impairment, defined as T-CogS ≤21 * Pregnancy * Active inflammatory bowel disease * Dysphagia requiring a pureed diet * Food allergies that would prevent adherence to a Mediterranean-style diet * Following a vegan diet that would prevent adherence to the study's Mediterranean-style dietary intervention. * Current participation in another interventional trial * Participation in an investigational medicinal product trial within the previous 90 days where this may affect study outcomes or participant burden * Previous participation in a My Moves Matter dietary programme.