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Relationship of coffee consumption with a decline in kidney function among patients with type 2 diabetes: The Fukuoka Diabetes Registry
Authors:Yuji Komorita  Toshiaki Ohkuma  Masanori Iwase  Hiroki Fujii  Hitoshi Ide  Yutaro Oku  Taiki Higashi  Ayaka Oshiro  Wakako Sakamoto  Masahito Yoshinari  Udai Nakamura  Takanari Kitazono
Affiliation:1. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka Japan ; 2. Diabetes Center, Hakujyuji Hospital, Fukuoka Japan ; 3. Steel Memorial Yawata Hospital, Kitakyushu Japan
Abstract:Aims/IntroductionThe evidence regarding the effects of coffee consumption on incident chronic kidney disease is inconclusive, and no studies have investigated the relationship in patients with diabetes. We aimed to prospectively investigate the relationship between coffee consumption and the decline in estimated glomerular function rate (eGFR) in patients with type 2 diabetes.Materials and MethodsA total of 3,805 patients (2,112 men, 1,693 women) with type 2 diabetes (mean age 64.2 years) and eGFR ≥60 mL/min/1.73 m2 were followed (completion of follow up, 97.6%; median 5.3 years). Coffee consumption was assessed at baseline. The end‐point was a decline in eGFR to <60 mL/min/1.73 m2 during the follow‐up period.ResultsDuring follow up, 840 participants experienced a decline in eGFR to <60 mL/min/1.73 m2. Higher coffee consumption reduced the risk of decline in eGFR. Compared with no coffee consumption, the multivariate‐adjusted hazard ratios (95% confidence intervals) were 0.77 (0.63–0.93) for less than one cup per day, 0.77 (0.62–0.95) for one cup per day and 0.75 (0.62–0.91) for two or more cups per day (P for trend 0.01). This trend was unaffected by further adjustment for baseline eGFR and albuminuria. The mean eGFR change per year was −2.16 mL/min/1.73 m2 with no coffee consumption, −1.89 mL/min/1.73 m2 with less than one cup per day, −1.80 mL/min/1.73 m2 with one cup per day and −1.78 mL/min/1.73 m2 with two or more cups per day (P for trend 0.03).ConclusionsCoffee consumption is significantly associated with a lower risk of decline in eGFR in patients with type 2 diabetes.
Keywords:Coffee, Estimated glomerular filtration rate, Type   2 diabetes
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