Millions of people begin their day with a cup of coffee, but a growing body of research suggests the method of preparation, rather than coffee itself, can significantly impact heart health and cholesterol levels. Recent studies indicate that compounds within coffee can raise levels of LDL cholesterol – often referred to as “disappointing” cholesterol – contributing to plaque buildup in arteries and increasing the risk of cardiovascular disease.
The key lies in diterpenes, specifically cafestol and kahweol, naturally present in coffee beans. According to nutritional sources, these compounds are responsible for over 80 percent of coffee’s effect on blood cholesterol, though the exact mechanism is still under scientific investigation. The concentration of these diterpenes varies dramatically depending on how the coffee is brewed.
Unfiltered brewing methods, such as French press, Turkish coffee, and boiled coffee, retain higher levels of cafestol and kahweol. In contrast, filtering coffee – using paper filters as in drip coffee makers or Chemex systems – substantially reduces their presence. Experts confirm that filtered coffee is the safer option for cardiovascular health. A study conducted by researchers at Uppsala University in Sweden tested various brewing methods, including French press and boiled coffee, and found a clear correlation between unfiltered methods and increased LDL cholesterol.
“The way coffee is prepared may be the determining factor in its impact on cholesterol levels and heart health, not the coffee itself,” stated Dr. Magdy Nazeih, a nutrition expert, in comments reported earlier this month. This finding underscores the importance of considering brewing technique alongside overall coffee consumption.
Experts emphasize that the use of paper filters significantly minimizes the transfer of these compounds into the final beverage, making filtered coffee a less impactful choice on lipid indicators within moderate consumption limits. Reports from health authorities indicate that assessing the health impact of coffee should include preparation method, alongside quantity, dietary habits, and overall lifestyle.
While the research highlights the impact of brewing methods, the broader implications for public health remain under investigation. No official recommendations regarding coffee preparation have been issued by major health organizations as of February 13, 2026.
