Global relationship between Mediterranean diet and the incidence and mortality of ischaemic heart disease

Background The purpose of this study was to clarify the global relationship between the Mediterranean diet score (MDS) and country-wise incidence and mortality of ischaemic heart disease (IHD) using an international database. Methods We used population data from a global longitudinal database covering 137 countries with a population of over one million. MDS were evaluated based on the total score of the nine foods that comprise the Mediterranean diet. The incidence and mortality of IHD by country was derived from the Global Burden of Disease (GBD) database. Average food (g/day/capita) and energy supply (kcal/day/capita) by country, excluding loss between production and household, were obtained from the Food and Agriculture Organization of the United Nations Statistics Division database. Data from the GBD database were used for body mass index, current smoking rates, physical activity, years of education and percentage of the Muslim population. We identified the percentage of the population over 65 years of age (aging rate) and gross domestic product per capita (US$/capita) using the World Bank database. A linear mixed-effect model was used for evaluating the effects of MDS on incidence and mortality of IHD controlled for socioeconomic and lifestyle variables. Results Analysis showed that MDS was significantly associated with IHD incidence after controlling for covariates (–1.01 ± 0.27, P < 0.001). Similarly, there was a significant association between MDS and IHD-related mortality after controlling for covariates (–0.73 ± 0.34, P < 0.05). Conclusion Analysis of 27 years of data suggests that a Mediterranean diet might have a preventive effect on IHD.