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Thee tegen diabetes*
Uit een Europees onderzoek onder inwoners van vijftig landen lijkt het dat het regelmatig drinken van gewone of zwarte thee de kans op diabetes type-2 duidelijk kan verlagen. Er werd gekeken naar meerdere aandoeningen in relatie tot zwarte thee doch er werd alleen een negatieve relatie gevonden met diabetes type-2.
Relationships between black tea consumption and key health indicators in the world: an ecological study
1. Ariel Beresniak1, 2. Gerard Duru1, 3. Genevieve Berger2, 4. Dominique Bremond-Gignac3 + Author Affiliations
1. 1Department of Research, Data Mining International, Geneva, Switzerland 
2. 2Department of R&D, Unilever, London, UK 
3. 3INSERM UMRS 968, Amiens University Hospital, Paris VI University, Amiens, France 
1. Correspondence to Dr Ariel Beresniak; aberesniak@datamining-international.com 
Abstract
Objectives The aim of this study was to investigate potential statistical relationships between black tea consumption and key health indicators in the world. The research question is: Does tea consumption is correlated with one or more epidemiological indicators? 
Design Ecological study using a systematic data-mining approach in which the unit of the analysis is a population of one country. 
Setting Six variables, black tea consumption data and prevalence data of respiratory diseases, infectious diseases, cancer, cardiovascular diseases and diabetes, have been studied at a global level. 
Participants Data from 50 participating countries in the World Health Survey were investigated. 
Primary and secondary outcomes measures Level of statistical relationships between variables. 
Results Principal component analysis established a very high contribution of the black tea consumption parameter on the third axis (81%). The correlation circle confirmed that the ‘black tea’ vector was negatively correlated with the diabetes vector and was not correlated with any of the other four health indicators. A linear correlation model then confirmed a significant statistical correlation between high black tea consumption and low diabetes prevalence. 
Conclusions This innovative study establishes a linear statistical correlation between high black tea consumption and low diabetes prevalence in the world. These results are consistent with biological and physiological studies conducted on the effect of black tea on diabetes and confirm the results of a previous ecological study in Europe. Further epidemiological research and randomised studies are necessary to investigate the causality. 
De studie.
(November 2012)


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