Mediterranean Diet Adherence Screener (MEDAS)

MEDAS scores ≥9 are conventionally used as the threshold for 'high' adherence in research (about 64% of the possible maximum). In the PREDIMED trial, participants scoring ≥9 showed strongest cardiovascular benefit. However, the threshold is somewhat arbitrary; the MEDAS is best interpreted as a continuous scale where higher scores indicate closer alignment with Mediterranean pattern, not as a diagnostic category.

Yes, MEDAS is appropriate for pre-post intervention assessment. Studies show that Mediterranean diet counseling or programs often increase MEDAS scores by 1–3 points over 6–12 months. Repeat MEDAS administration at follow-up visits (e.g., 3, 6, 12 months) can document dietary change and reinforce adherence with visual feedback.

The MEDAS focuses on the core distinctive components of Mediterranean diet (olive oil, vegetables, legumes, fish, nuts) and explicitly assesses against high consumption of red meat and processed foods. Dairy is not included (Mediterranean regions vary in dairy intake). Whole grains are not explicitly queried but are often embedded in 'legume' and 'carbohydrate' items. For detailed grain assessment, supplementary questions or food frequency questionnaire items are recommended.

No. The wine item contributes 1 point toward the 14-point total; abstainers can achieve a maximum score of 13. Wine consumption is presented as part of the Mediterranean pattern but not essential. Individuals with contraindications to alcohol (liver disease, pregnancy, certain medications, personal history of alcohol misuse) can skip the wine item or score it as 0 without preventing overall high adherence classification.

Other tools include the PREDIMED Food Frequency Questionnaire (FFQ; ~150 items, detailed nutrient assessment), the Mediterranean Dietary Score (MDS; varies in length and components by version), and the MEDAS-Plus (expanded version with additional items). The MEDAS is the shortest, fastest (2–5 minutes), and most user-friendly for clinical and large-scale research settings. Full FFQs provide more nutrient detail but require longer administration (30–45 minutes). Choice depends on study precision needs and administrative burden.

The MEDAS assumes relative availability and affordability of Mediterranean diet components. In lower-income settings or regions where olive oil, fresh vegetables, or fish are expensive or unavailable, MEDAS scores may not reflect true effort to follow Mediterranean principles. Clinical interpretation should account for socioeconomic and geographic context; counseling should focus on affordable local adaptations (e.g., substituting available legumes and seasonal vegetables) rather than strict Mediterranean diet replication.