The aim of this pilot study is to assess whether an online Mediterranean diet programme called MediPD is acceptable and practical for people living with Parkinson's disease, and whether it can help them make and maintain changes towards a Mediterranean-style diet. The study will include 120 adults living in the United Kingdom with Parkinson's disease who have access to an internet-enabled device and currently have low adherence to a Mediterranean-style diet. Participants will be randomly assigned to one of two groups. One group will receive access to the MediPD online programme, which includes short educational videos, personalised dietary information, practical resources, goal-setting tools, and online dietetic support. The other group will continue with their usual care and will receive access to MediPD after completing the final study assessment. Researchers will compare the groups to see whether MediPD improves adherence to a Mediterranean diet after 24 weeks. The study will also examine dietary intake, non-motor symptoms, quality of life, gastrointestinal symptoms, cognitive function, and how acceptable and practical the programme is to use. Assessments will take place at the start of the study, at 12 weeks, and at 24 weeks.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
DOUBLE
Enrollment
120
MediPD is a 12-week online Mediterranean diet behaviour-change programme for people with Parkinson's disease. It provides personalised educational videos, practical resources, self-monitoring tools, and moderated dietetic support. Participants are encouraged to complete at least one module per week, aiming to adopt and maintain Mediterranean-style dietary changes over 24 weeks.
Change in Mediterranean Diet Adherence using a Mediterranean Diet Score at 24 Weeks
Adherence to a Mediterranean diet will be assessed using the Mediterranean Diet Score (MDS), derived from a validated 14-item questionnaire. Total scores range from 0 to 14, with higher scores indicating greater adherence to a Mediterranean diet.
Time frame: Baseline to 24 weeks
Change in Mediterranean Diet Adherence using a Mediterranean Diet Score at 12 Weeks
Adherence to a Mediterranean diet will be assessed using the Mediterranean Diet Score (MDS), derived from a validated 14-item questionnaire. Total scores range from 0 to 14, with higher scores indicating greater adherence to a Mediterranean diet.
Time frame: Baseline to 12 weeks
Change in self-reported dietary intake using a 24-hour Dietary Recall
Dietary intake will be assessed using Intake24, an online 24-hour dietary recall tool. Outcomes will include mean daily intake of energy (kcal/day), foods and macronutrients (g/day and, where appropriate, percentage of energy), and micronutrients (mg or µg/day, as appropriate). Higher values indicate greater intake of food/nutrients.
Time frame: Baseline, 12 weeks and 24 weeks.
Change in Parkinson's Disease Non-Motor Symptoms using the Movement Disorder Society Non-Motor Rating Scale (MDS-NMS)
Non-motor symptoms will be assessed using the validated 52-item, rater-administered Movement Disorder Society Non-Motor Rating Scale (MDS-NMS). Total scores range from 0 to 832, with higher scores indicating a greater non-motor symptom burden and a worse outcome.
Time frame: Baseline, 12 weeks and 24 weeks.
Change in reported Gastrointestinal Symptoms using the Gastrointestinal Symptom Rating Scale (GSRS)
Gastrointestinal symptoms will be assessed using the 15-item Gastrointestinal Symptom Rating Scale (GSRS). Items are scored from 1 to 7 and summed to provide a total score ranging from 15 to 105. Higher total scores indicate greater gastrointestinal symptom severity and therefore a worse outcome.
Time frame: Baseline, 12 weeks and 24 weeks.
Change in quality of life using the Parkinson's Disease Questionnaire (PDQ-39)
Quality of life will be assessed using the 39-item Parkinson's Disease Questionnaire (PDQ-39), which covers eight domains. Each domain score is transformed to a 0-100 scale, and the mean of the eight domain scores provides the PDQ-39 Summary Index. Higher Summary Index scores indicate poorer health-related quality of life and therefore a worse outcome.
Time frame: Baseline, 12 weeks and 24 weeks.
Change in cognitive function using TestMyBrain cognitive test battery
Cognitive function will be assessed using the TestMyBrain cognitive test battery, comprising Verbal Paired Associates, Visual Paired Associates, Backward Digit Span, Digit Symbol Matching, and Trail Making A and B. Each test score will be converted to a z-score and oriented so that higher scores consistently indicate better performance. The z-scores will be summed to provide an overall cognitive composite score with higher scores indicating better cognitive function.
Time frame: Baseline, 12 weeks and 24 weeks.
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