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IJE Advance Access published online on January 4, 2006
International Journal of Epidemiology, doi:10.1093/ije/dyi296
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Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2006; all rights reserved.
Accepted November 29, 2005

Original paper

Diet synergies and mortality--a population-based case-control study of 32 462 Hong Kong Chinese older adults

C. Mary Schooling 1, Sai Yin Ho 1, Gabriel M. Leung 1 *, G. Neil Thomas 1, Sarah M. McGhee 1, Kwok Hang Mak 2, and Tai Hing Lam 1

1 Department of Community Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
2 Department of Health, Kowloon, Hong Kong, China

* To whom correspondence should be addressed.
Gabriel M. Leung, E-mail: gmleung{at}hku.hk


  Abstract

Background Food and drink are not consumed in isolation and can have complimentary effects enhancing or blocking the overall uptake of nutrients. We investigated how combinations of foods, drinks, and smoking affected mortality.

Method Adjusted logistic regression was used to assess the joint effect of healthy foods, less healthy foods, smoking, and alcohol use on mortality in a case-control study of all Chinese adults aged 60 or over who died in 1998; 21 494 dead cases (81% of all registered deaths) and 10 968 live controls were included.

Results There was a significant trend of increasing all-cause mortality risk with decreasing healthy food consumption (P < 0.001), and the increase in risk was significantly steeper for people with high intakes of less healthy food (P for interaction <0.001). There was a steeper risk from increasing less healthy food intake in ever-smokers and people not drinking tea regularly (P < 0.001), while the J-shaped relationship between alcohol and mortality differed in shape with level of less healthy food intake.

Conclusion Intake of some dietary items may modify the effect of others. An analysis framework explicitly recognizing complementary and potentially synergistic effects of food, drinks, and smoking could enhance our understanding of dietary epidemiology.

Keywords: Diet; synergy; mortality; smoking; older adults; case-control.
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