Compared with not drinking coffee, consuming six cups per day has been associated with a 33% lower risk for T2D. A separate study found that every additional cup of coffee consumed daily may contribute to as much as a 7% reduction in excess risk for T2D. Conversely, decreasing consumption has been linked to a higher risk for T2D. Even decaffeinated coffee has been shown to be beneficial.
Drinking boiled coffee does not appear to be as beneficial as drinking filtered coffee, when it comes to T2D. Boiled coffee is made with coarsely ground coffee beans that are then added directly to the water. This method includes Turkish and Greek coffee or espresso-based drinks, which are most common in Southern Europe. In a Swedish study, adults who drank two to three cups of filtered coffee a day had a 58% lower risk of developing T2D within 10 years than those who drank fewer than one cup of filtered coffee a day (lowest quartile) after adjusting for multiple confounders (odds ratio, 0.42; 95% CI, 0.23-0.75). The protective effect of drinking this high amount on the risk of developing T2D was not seen with boiled coffee. Coffee's protective effects may be strongest when consumed at lunchtime.
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Cite this: Yasmine S. Ali, Helmi L. Lutsep, Romesh Khardori, et. al. Fast Five Quiz: Coffee Health Effects - Medscape - Jan 07, 2022.