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Drinking coffee 'can cut diabetes risk', suggests study of nurses


Upping coffee consumption can result in an “immediate” reduction in diabetes risk, according to US researchers who assessed data on thousands of nurses.

Increasing intake by more than one cup a day was associated with an 11% lower risk of type 2 diabetes over the next four years, they found.

Reducing consumption by at least one cup had the opposite effect, raising diabetes risk by 17%.

People drinking three cups or more were 37% less likely to develop type 2 diabetes than those consuming one cup or less.

“Changes in coffee consumption habit can affect type 2 diabetes risk in a relatively short period of time”

Shilpa Bhupathiraju

The research, involving almost 124,000 men and women, adds to previous evidence linking coffee drinking and protection from diabetes.

Unlike previous research, it only found a positive association with caffeinated coffee − possibly because so few participants drank decaffeinated versions.

The authors, led by Professor Frank Hu, from the Harvard School of Public Health, wrote in the journal Diabetologia: “The findings of the current study… demonstrate that change in coffee consumption is associated with both immediate and long-term diabetes risk.

“Changes in coffee consumption habits appear to affect diabetes risk in a relatively short amount of time,” he said.


Frank Hu

A study of pooled data published in the journal Diabetes Care in February, also led by Professor Hu, showed that consuming six cups of coffee a day lowered type 2 diabetes risk by a third compared with drinking no coffee. In that study, it made no difference whether or not the coffee contained caffeine.

For the new research, researchers analysed the results of three large US diet and lifestyle investigations involving health professionals: the Nurses’ Health Study, the Nurses’ Health Study II, and the Health Professionals Follow-Up Study.

Participants’ diets were assessed every four years by questionnaire, and those developing type 2 diabetes identified. In total, 7,269 cases of diabetes were recorded.

There was no evidence that tea consumption had a similar effect on diabetes risk. Again, this may have been due to the low number of people who drank tea or altered their tea consumption, said the scientists.

Co-author Dr Shilpa Bhupathiraju, also from the Harvard School of Public Health, said: “Our findings confirm those of previous studies that showed that higher coffee consumption was associated with lower type 2 diabetes risk.

“Most importantly, they provide new evidence that changes in coffee consumption habit can affect type 2 diabetes risk in a relatively short period of time.”

“This does not mean that increasing your coffee intake will reduce your diabetes risk”

Richard Elliott

But Dr Richard Elliott, research communications officer at Diabetes UK, urged people to treat the findings with caution.

He said: “While this study found evidence of a connection between how much coffee you drink and your risk of type 2 diabetes, this does not mean that increasing your coffee intake will reduce your diabetes risk.

“Even if people who drank more coffee did tend to have a lower risk of type 2, it does not necessarily follow that coffee consumption was directly responsible,” he said.

“Other factors that this study has not identified could also be involved and it is even possible that being at high risk of type 2 diabetes encourages people to reduce their coffee intake,” he added.




Readers' comments (2)

  • A good follow up study would be coffee intake and any relation with dehydration and renal function in NHS workers.

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  • Anonymous | 2-May-2014 0:12 am

    excellent proposal. recommendations from the study may enforce the need for proper breaks!

    our filter coffee machine was on the go all day and every day and we even had difficulties getting rid of the calcium deposits when it packed up and on its regular cleans. we got through quite a number of machines and filters. Strength of coffee depended on who made it but it was never very weak and I got up to 6 cups a day before I even realised, until one day I was sweating and trembling so much I had to fetch a colleague to administer an iv injection in my place! I obviously then reduced and was relieved to find i wasn't hooked.

    there is matter of great concern now with the new power saving EU regs reported in the Telegraph the other day that all new machines will have to be fitted with an automatic switch off after 20 minutes on standby, although there will apparently be an override mode.

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