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European Journal of Nutrition

, Volume 54, Issue 1, pp 139–148 | Cite as

Mediterranean diet and mortality in Switzerland: an alpine paradox?

  • Kerstin Vormund
  • Julia Braun
  • Sabine Rohrmann
  • Matthias Bopp
  • Peter Ballmer
  • David FaehEmail author
Original Contribution

Abstract

Purpose

Reports on the protective effect of a Mediterranean diet on mortality usually refer to populations from Mediterranean countries, leaving uncertain whether really diet is the fundamental cause. Our aim was to examine the effect of a Mediterranean diet on mortality in Switzerland, a country combining cultural influences from Mediterranean and Central European countries within a common national health and statistical registry.

Methods

In this prospective investigation, we included 17,861 men and women aged ≥16 years who participated 1977–1993 in health studies and were followed up for survival until 2008 by anonymous record linkage with the Swiss National Cohort. A 9-point score Mediterranean Diet Score (MDS) was used to assess adherence to a Mediterranean diet. Mortality hazard ratios (HR) and 95 % confidence intervals (CIs) were calculated by using Cox regression models adjusted for age, sex, survey wave, marital status, smoking, body mass index, language region and nationality.

Results

In all language regions, MDS was inversely associated with mortality. Consumption of dairy products was also consistently associated with lower mortality. When categorizing dairy food consumption as beneficial instead of harmful, this association between MDS and mortality increased in strength and was partly statistically significant. For all causes of death combined (HR for a one-point increase in MDS 0.96, 95 % CI 0.94–0.98), in men (0.94, 0.92–0.97), in women (0.98, 0.95–1.02) for cardiovascular diseases (CVD, 0.96, 0.92–0.99; 0.95, 0.90–1.00; 0.98, 0.92–1.04) and for cancer (0.95, 0.92–0.99; 0.92, 0.88–0.97; 0.98, 0.93–1.04).

Conclusions

Stronger adherence to a Mediterranean diet was associated with lower all-cause, CVD and cancer mortality, largely independently of cultural background. These associations were primary due to the effect in men. Our finding of a beneficial rather than a deleterious impact of dairy products consumption prompts at considering culturally adapted Mediterranean diet recommendations. However, results should be interpreted with caution since only a crude 1-day dietary estimate was available to assess individuals’ habitual dietary intake.

Keywords

Mediterranean diet Alpine paradox Dairy food Mortality Switzerland 

Abbreviations

BMI

Body mass index

CI

Confidence interval

CVD

Cardiovascular disease

HR

Hazard ratio

ICD

International Classification of Diseases

MDS

Mediterranean Diet Score

MONICA

MONItoring of trends and determinants in CArdiovscular disease

NRP 1A

National Research Programm 1A

SNC

Swiss National Cohort

WHO

World Health Organization

Notes

Acknowledgments

The authors thank the Swiss Federal Statistical Office for providing mortality and census data and for the support which made the Swiss National Cohort and this study possible. The members of the Swiss National Cohort Study Group are Milo Puhan (Chairman of Scientific Board), Matthias Bopp (both Zurich), Matthias Egger (Chairman of Executive Board), Adrian Spoerri, Marcel Zwahlen (all Bern), Nino Künzli (Basel), Fred Paccaud (Lausanne) and Michel Oris (Geneva). This work was supported by the Swiss National Science Foundation (Grants 3347CO-108806 and 33CS30-134273).

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

394_2014_695_MOESM1_ESM.doc (204 kb)
Supplementary material 1 (DOC 204 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Kerstin Vormund
    • 1
  • Julia Braun
    • 2
  • Sabine Rohrmann
    • 2
  • Matthias Bopp
    • 2
  • Peter Ballmer
    • 3
  • David Faeh
    • 2
    Email author
  1. 1.LucerneSwitzerland
  2. 2.Institute of Social and Preventive Medicine (ISPM)University of ZurichZurichSwitzerland
  3. 3.Department of MedicineKantonsspital WinterthurWinterthurSwitzerland

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