(HealthDay News) — For patients with type 2 diabetes, consumption of green tea and coffee is associated with reduced all-cause mortality, according to a study published online in BMJ Open Diabetes Research & Care.

Yuji Komorita, MD, PhD, from Kyushu University in Fukuoka, Japan, and colleagues conducted a prospective investigation to examine the impact of consuming green tea and coffee on mortality among 4923 patients with type 2 diabetes from the Fukuoka Diabetes Registry.

The researchers note that 309 participants died during the follow-up period. There was a reduction seen in all-cause mortality with consumption of green tea, coffee, and a combination. For green tea consumption, multivariable-adjusted hazard ratios compared with none (referent) were 0.85 (95% confidence interval, 0.60 to 1.22), 0.73 (0.51 to 1.03), and 0.60 (0.42 to 0.85) for no more than 1, 2 to 3, and at least 4 cups/day, respectively (P trend, 0.002). For coffee, the multivariable-adjusted hazard ratios were 1.0 (referent), 0.88 (0.66 to 1.18), 0.81 (0.58 to 1.13), and 0.59 (0.42 to 0.82) for none, less than 1, 1, and at least 2 cups/day, respectively (P trend, 0.002). For the combination, the multivariable-adjusted hazard ratios were 0.49 (0.24 to 0.99), 0.42 (0.20 to 0.88), and 0.37 (0.18 to 0.77) for 2 to 3 cups green tea with at least 2 cups coffee, at least 4 cups green tea with one cup coffee, and at least 4 cups of green tea with at least 2 cups coffee per day, respectively.


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“Our results suggest that consuming green tea and coffee may have beneficial effects on the longevity of Japanese people with type 2 diabetes,” the authors write.

Reference

Komorita Y, Iwase M, Fujii H, et al. Additive effects of green tea and coffee on all-cause mortality in patients with type 2 diabetes mellitus: the Fukuoka Diabetes Registry. BMJ