Mediterranean Diet Adherence Screener [PREDIMED-14 / MEDAS]

Description

The Mediterranean Diet Adherence Screener (MEDAS), also known as PREDIMED-14, is a brief 14-item instrument developed within the PREDIMED (PREvención con DIeta MEDiterránea) study to assess adherence to the Mediterranean dietary pattern.

The tool provides a rapid and practical estimate of diet quality without requiring the more extensive dietary recording procedures typically associated with comprehensive food-frequency questionnaires.

It evaluates characteristic dietary behaviors such as the use of olive oil and the consumption of vegetables, fruits, legumes, fish, nuts, and other foods associated with the Mediterranean diet, while also considering the limited consumption of foods such as red and processed meat, animal fats, sugar-sweetened beverages, and commercial sweets.

Purpose

The primary purpose of the PREDIMED-14/MEDAS is to assess the degree of adherence to the Mediterranean diet and to identify individuals whose dietary habits differ from this nutritional pattern.

The instrument has been extensively used in studies examining the relationship between Mediterranean diet adherence and obesity, cardiovascular risk, metabolic health, and other cardiometabolic outcomes.

Higher adherence to the Mediterranean dietary pattern has been associated with more favorable health indicators, including lower obesity-related measures and a healthier cardiovascular risk profile.

Structure and Scoring

The MEDAS consists of 14 items. Most items assess the frequency or quantity of consumption of specific food groups, while others assess characteristic dietary habits.

Each item is scored as follows:

1 point: the predefined Mediterranean diet criterion is met.

0 points: the criterion is not met.

The total score is calculated by summing the responses across all 14 items and therefore ranges from 0 to 14.

Higher total scores indicate greater adherence to the Mediterranean dietary pattern.

Examples of favorable behaviors assessed by the tool include the use of olive oil as the main culinary fat, adequate consumption of vegetables, fruits, legumes, fish, and nuts, and restricted intake of red meat, animal fats, sweetened beverages, and commercial pastries or sweets.

Interpretation

The fundamental interpretation of the MEDAS score is straightforward: higher scores reflect stronger adherence to the Mediterranean diet.

In research settings, scores are sometimes categorized approximately as:

≤5: Low adherence
6–9: Moderate adherence
≥10: High adherence

However, cut-off values may differ across studies and populations. Therefore, the specific classification system used should always be clearly reported in the methodology of each study.

Validity and Reliability

The MEDAS has been evaluated as a brief dietary assessment instrument and has been compared with more detailed methods such as food-frequency questionnaires and dietary records.

Validation studies have shown satisfactory agreement with more comprehensive dietary assessment methods, supporting its usefulness as a practical measure of Mediterranean diet adherence.

Within the PREDIMED study, higher MEDAS scores were also inversely associated with obesity indicators, including body mass index and waist circumference, supporting the instrument’s value as a concise indicator of overall dietary quality.

Applications

The PREDIMED-14/MEDAS may be used in epidemiological studies, clinical research, nutritional interventions, preventive medicine, and studies of cardiovascular and metabolic health.

Its brief format makes it particularly useful in large research protocols, population-based studies, and clinical settings where a quick assessment of Mediterranean diet adherence is required.

The instrument may also be useful for monitoring changes in dietary behavior over time and for evaluating the effectiveness of nutrition-focused interventions.

Conclusion

The PREDIMED-14/MEDAS is a concise, practical 14-item instrument for assessing adherence to the Mediterranean diet.

Its 0–14 scoring system provides a simple way to quantify dietary adherence, with higher scores indicating closer alignment with the core principles of the Mediterranean dietary pattern.

Its ease of administration and widespread use in cardiovascular and nutritional research make it a valuable tool for both research and applied health settings.

References

Martínez-González, M. A., García-Arellano, A., Toledo, E., et al. (2012). A 14-item Mediterranean diet assessment tool and obesity indexes among high-risk subjects: The PREDIMED trial. PLoS ONE, 7(8), e43134.

Babio, N., Bulló, M., Basora, J., et al. (2009). Adherence to the Mediterranean diet and risk of metabolic syndrome and its components. Nutrition, Metabolism and Cardiovascular Diseases, 19(8), 563–570.

Sánchez-Taínta, A., Estruch, R., Bulló, M., et al. (2008). Adherence to a Mediterranean-type diet and reduced prevalence of clustered cardiovascular risk factors in a cohort of high-risk patients. European Journal of Cardiovascular Prevention & Rehabilitation, 15(5), 589–593.

Panagiotakos, D. B., Pitsavos, C., Arvaniti, F., & Stefanadis, C. (2007). Adherence to the Mediterranean food pattern predicts the prevalence of hypertension, hypercholesterolemia, diabetes and obesity among healthy adults: The accuracy of the MedDietScore. Preventive Medicine, 44(4), 335–340.

Note: The MedDietScore developed by Panagiotakos et al. is a different instrument from the PREDIMED-14/MEDAS. The MEDAS uses binary scoring for each of its 14 items, whereas the MedDietScore follows a different scoring approach.