The aim of this systematic review was to evaluate the effects of coffee consumption on  glucose metabolism . Eight clinical trials (n = 247 subjects) were identified for analyses. Short-term studies showed that consumption of caffeinated coffee may increase the area under the curve for glucose response, while for long-term studies, caffeinated coffee may improve the  glycaemic  metabolism by reducing the glucose curve and increasing the  insulin response .

Abstract

Epidemiological studies indicate an inverse association of coffee consumption with risk of  type 2 diabetes mellitus . However, studies to determine the clinical effects of coffee consumption on the glucose metabolism biomarkers remain uncertain. The aim of this systematic review was to evaluate the effects of coffee consumption on  glucose metabolism . A search of electronic databases (PubMed and Web of Science) was performed identifying studies published until September 2017. Eight clinical trials (n = 247 subjects) were identified for analyses. Participants and studies characteristics, main findings, and study quality (Jadad Score) were reported. Short-term (1–3 h) and long-term (2–16 weeks) studies were summarized separately. Short-term studies showed that consumption of caffeinated coffee may increase the area under the curve for glucose response, while for long-term studies, caffeinated coffee may improve the  glycaemic  metabolism by reducing the glucose curve and increasing the  insulin response . The findings suggest that consumption of caffeinated coffee may lead to unfavourable acute effects; however, an improvement on glucose metabolism was found on long-term  follow-up .

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