Study: Black Coffee May Reduce Diabetes Risk in Women

A recent study published in the journal Nutrients has found that drinking black coffee may significantly improve insulin sensitivity in women, potentially lowering the risk of developing type 2 diabetes.

Using data from the Korea National Health and Nutrition Examination Survey (2019–2021), researchers analyzed the coffee consumption habits of over 7,000 Korean adults. Participants reported their daily coffee intake, including the type of coffee consumed, over a 24-hour period.

The findings revealed that women who drank two or more cups of black coffee daily had better insulin sensitivity and lower insulin resistance compared to those who drank no coffee or consumed coffee with additives like sugar or cream.

“Consuming two or more cups of black coffee per day is inversely associated with insulin resistance in Korean women,” the study noted. This suggests a potential protective role of black coffee against metabolic disorders.

Insulin sensitivity refers to how effectively the body responds to insulin, the hormone responsible for regulating blood sugar levels. Higher sensitivity means the body can efficiently move sugar from the bloodstream into cells for energy, thereby reducing the risk of high blood sugar and diabetes. Conversely, insulin resistance can lead to elevated blood sugar levels and an increased risk of type 2 diabetes and related health issues.

Researchers point to coffee’s rich content of polyphenols—especially chlorogenic acid—as a likely contributor to these benefits. These natural compounds are known for their anti-inflammatory properties and their role in supporting healthy glucose metabolism.

However, experts caution that moderation is key. While black coffee may offer metabolic benefits, excessive caffeine intake can disrupt sleep and cause unwanted side effects such as restlessness or anxiety. Additionally, to gain the full potential health advantages, it’s best to consume coffee without sugar, flavored syrups, or high-fat creamers.

In summary, your daily cup of black coffee may be doing more than just providing a morning boost—it could be supporting your long-term metabolic health, particularly for women.