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21-02-2010 | Diabetes | Article

High coffee consumption lowers risk for Type 2 diabetes


Free abstract

MedWire News: A high level of coffee consumption is associated with a significantly reduced risk for developing Type 2 diabetes in high-risk individuals, report researchers.

Increased consumption of both coffee and tea has previously been associated with a reduced risk for Type 2 diabetes, as reported by MedWire News.

In this study, Ying Zhang (University of Oklahoma Health Sciences Center, Oklahoma City, USA) and colleagues investigated this association further by studying 1141 individuals with normal glucose tolerance from an American-Indian population with a high incidence and prevalence of Type 2 diabetes.

The participants were aged 45–74 years and were followed up for 7.6 years on average for incident Type 2 diabetes. Coffee consumption was recorded at baseline during personal interview sessions.

Writing in the journal Nutrition, Metabolism, and Cardiovascular Diseases, the team report that the incidence of Type 2 diabetes fell with increasing amounts of coffee consumption.

Specifically, the incidence of Type 2 diabetes was 21.6%, 18.9%, 17.2%, 14.5%, 15.9%, and 8.7%, in those who consumed 1–2, 3–4, 5–7, 8–11, and 12 or more cups of coffee per day, respectively.

Of note, following univariate analysis levels of coffee consumption were positively related to current smoking, and inversely related to hypertension, body mass index, female gender, and waist circumference.

Compared with those who did not drink coffee (n=111), those who drank 12 or more cups per day (n=92) had a significant 67% reduction in risk for developing diabetes over the follow-up period following adjustment for potential confounding factors.

“Further studies are needed to determine whether this association is causal or a result of unmeasured confounders,” conclude the authors.

“The potential effects of high level of coffee consumption on risk for Type 2 diabetes may be important but should be considered in light of putative health effects of coffee, such as potential detrimental effects on blood pressure and sleep quality,” they add.

MedWire ( is an independent clinical news service provided by Current Medicine Group, a trading division of Springer Healthcare Limited. © Springer Healthcare Ltd; 2010

By Helen Albert