30/05/2026
Unfiltered coffee raises your LDL cholesterol. Filtered coffee does not. The bean is identical. The only thing that changes is whether the brew passes through paper.
Coffee oil carries two diterpenes, cafestol and kahweol. They survive in French press, espresso, boiled, and Turkish coffee, and a paper filter traps almost all of them. That single step is the difference.
Once in your body, the diterpenes lead the liver to clear less cholesterol from your blood, and LDL climbs. Cafestol is one of the most potent cholesterol-raising compounds in the diet, and the effect shows up in controlled human trials, not just observational data. The diterpenes nudge triglycerides up too.
How much you get depends almost entirely on the brewing method. Per cup:
Unfiltered or boiled: about 4.4 mg
French press: about 2.8 mg
Espresso: about 1.2 mg
Paper-filtered drip: about 0.08 mg
That is roughly a 55-fold difference between an unfiltered cup and a paper-filtered one of the same coffee.
The long-term data points the same way. In 508,747 Norwegians followed for about 20 years, filtered coffee drinkers had lower mortality than people who drank no coffee at all. Unfiltered drinkers saw little or none of that benefit, and in men over 60, heavy unfiltered intake was associated with higher cardiovascular death. The risk tracked cholesterol: it grew when cholesterol was removed from the statistical model.
One honest caveat. That the LDL rise happens is well established. The exact molecular step, how the diterpenes lower cholesterol clearance, is still being worked out.
If your LDL is a concern, this is one of the easiest levers you have. You do not have to give up coffee. You just have to run it through paper.
Naidoo et al., Nutr J, 2011
Urgert et al., Eur J Clin Nutr, 1995
de Roos et al., J Intern Med, 2000
Tverdal et al., Eur J Prev Cardiol, 2020