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Review

Coffee and Lower Risk of Type 2 Diabetes: Arguments for a Causal Relationship

1
Faculty of Medicine, University of Duesseldorf, Moorenstr. 5, 40225 Duesseldorf, Germany
2
West-German Centre of Diabetes and Health, Duesseldorf Catholic Hospital Group, Hohensandweg 37, 40591 Duesseldorf, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Jason Tallis and Neil D. Clarke
Nutrients 2021, 13(4), 1144; https://doi.org/10.3390/nu13041144
Received: 9 March 2021 / Revised: 23 March 2021 / Accepted: 27 March 2021 / Published: 31 March 2021
(This article belongs to the Collection Coffee and Caffeine Consumption for Health and Performance)
Prospective epidemiological studies concur in an association between habitual coffee consumption and a lower risk of type 2 diabetes. Several aspects of these studies support a cause–effect relationship. There is a dependency on daily coffee dose. Study outcomes are similar in different regions of the world, show no differences between sexes, between obese versus lean, young versus old, smokers versus nonsmokers, regardless of the number of confounders adjusted for. Randomized controlled intervention trials did not find a consistent impact of drinking coffee on acute metabolic control, except for effects of caffeine. Therefore, lowering of diabetes risk by coffee consumption does not involve an acute effect on the post-meal course of blood glucose, insulin or insulin resistance. Several studies in animals and humans find that the ingestion of coffee phytochemicals induces an adaptive cellular response characterized by upregulation and de novo synthesis of enzymes involved in cell defense and repair. A key regulator is the nuclear factor erythroid 2-related factor 2 (Nrf2) in association with the aryl hydrocarbon receptor, AMP-activated kinase and sirtuins. One major site of coffee actions appears to be the liver, causing improved fat oxidation and lower risk of steatosis. Another major effect of coffee intake is preservation of functional beta cell mass via enhanced mitochondrial function, lower endoplasmic reticulum stress and prevention or clearance of aggregates of misfolded proinsulin or amylin. Long-term preservation of proper liver and beta cell function may account for the association of habitual coffee drinking with a lower risk of type 2 diabetes, rather than acute improvement of metabolic control. View Full-Text
Keywords: coffee; diabetes; caffeine; chlorogenic; acids; hepatosteatosis; beta cells; hormesis; Nrf2 coffee; diabetes; caffeine; chlorogenic; acids; hepatosteatosis; beta cells; hormesis; Nrf2
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MDPI and ACS Style

Kolb, H.; Martin, S.; Kempf, K. Coffee and Lower Risk of Type 2 Diabetes: Arguments for a Causal Relationship. Nutrients 2021, 13, 1144. https://doi.org/10.3390/nu13041144

AMA Style

Kolb H, Martin S, Kempf K. Coffee and Lower Risk of Type 2 Diabetes: Arguments for a Causal Relationship. Nutrients. 2021; 13(4):1144. https://doi.org/10.3390/nu13041144

Chicago/Turabian Style

Kolb, Hubert, Stephan Martin, and Kerstin Kempf. 2021. "Coffee and Lower Risk of Type 2 Diabetes: Arguments for a Causal Relationship" Nutrients 13, no. 4: 1144. https://doi.org/10.3390/nu13041144

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