Four Cups of Coffee a Day Slash Diabetes Risk in Half

Drinking four cups of coffee daily may decrease a woman's risk of Type 2 diabetes by more than half. Coffee raises the amount of sex hormone-binding globulin (SHBG) in the blood, and higher levels of SHBG are known to lower the Type 2 diabetes risk.

It's most likely that the protective effect is conferred by something in the coffee other than the caffeine.

According to Live Science:

"In [a] new study, researchers ... compared the medical histories and coffee-drinking habits of 359 women who had diabetes with those of 359 healthy women over 10 years ... Women who drank four cups of caffeinated coffee a day had higher levels of SHBG and were 56 percent less likely to develop Type 2 diabetes than women who don't drink coffee, the researchers found."

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