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# Increased coffee intake linked to reduced diabetes mellitus risk
- URL: https://www.foodconsumer.org/coffee_lowers_diabetes_mellitus_irsk_0726140440/
- Published: 2014-07-26T17:39:00.000Z
- Updated: 2026-09-22T16:16:08.000Z
- Description: Across three US cohorts totalling about 123,700 people, raising coffee intake by more than a cup a day over four years went with 11 percent lower type 2 diabetes risk in the next four years, while cutting back by more than a cup went with 17 percent higher risk. Tea changes showed no link.
- Author: Food Consumer
- Tags: Food, Nutrition, #vivvo-import

Saturday July 26, 2014 (foodconsumer.org) -- In the journal Diabetologia, a study suggests that drinking coffee can reduce risk of diabetes mellitus type 2.

Coffee and tea consumption has previously associated with reduced risk for developing type 2 diabetes mellitus. The current study examined how changes in coffee consumption affected risk of type 2 diabetes mellitus.

The study shows that over four years, increasing coffee consumption by more than 1 cup per day (mean change = 1.7 cup per day) was associated with 11% reduced risk of type 2 diabetes mellitus in the subsequent four years.

On the other hand, reducing coffee drinking by more than 1 cup per day (mean change = 2 cups per day) during a four-year period was associated with 17% increased risk of type 2 diabetes mellitus in the subsequent four years.

The study was based on data from 48,464 women in the Nurses’ Health Study (1986–2006), 47,510 women in NHS II (1991–2007), and 27,759 men in the Health Professionals Follow-up Study (1986–2006).

Changes in tea consumption were not correlated with type 2 diabetes mellitus risk.

The study concludes "Our data provide novel evidence that increasing coffee consumption over a 4 year period is associated with a lower risk of type 2 diabetes, while decreasing coffee consumption is associated with a higher risk of type 2 diabetes in subsequent years."

*Reference: Shilpa N. Bhupathiraju, An Pan, JoAnn E. Manson, Walter C. Willett, Rob M. van Dam, Frank B. Hu, Changes in coffee intake and subsequent risk of type 2 diabetes: three large cohorts of US men and women, Diabetologia, July 2014, Volume 57, Issue 7, pp 1346-1354*

Another study published this year in the medical journal Diabetes Care confirms an early review that suggests drinking coffee, either caffeinated or decaffeinated, can significantly reduce the risk of type 2 diabetes mellitus.

An early meta-analysis has suggested drinking coffee can decrease the risk of type 2 diabetes mellitus. This study led by Frank Hu and colleagues at Harvard Medical School reveals the same inverse association.

The data used for the new meta-analysis were collected from relevant cohort or nested case-control studies published from 1966 through Feb. 2013, which followed participants for 10 months to 20 years.

The study finds that drinking one additional cup of caffeinated coffee a day was correlated with 9% reduced risk for type 2 diabetes mellitus. Drinking one more cup of additional decaffeinated coffee was linked to a 6% reduced risk.

Those who drank 6 cups of coffee were 33% less likely to develop type 2 diabetes mellitus.

The researchers of this study concluded "Coffee consumption was inversely associated with the risk of type 2 diabetes in a dose-response manner." 

Keep in mind that neither of the studies was a trial and they could not prove that drinking coffee was the cause for the reduced risk of type 2 diabetes mellitus. Additional research is needed to confirm that drinking coffee can indeed lower the risk. (David Liu)