It depends on the case; there is no single guideline.
Randomized trial (64 people): UNFILTERED coffee (plunger pot) raised blood homocysteine, a possible cardiovascular risk factor, because of its diterpenes (which the paper filter retains). Filtering coffee avoids this effect (and also the cholesterol rise from cafestol).
View the study (study) →⏱ 2 min read
Coffee prepared without a paper filter (French press, Turkish coffee pot, Scandinavian boiled coffee, strong espresso) retains two lipid compounds from the bean (cafestol and kahweol) that a paper filter does retain; these compounds raise cholesterol and homocysteine, which changes the cardiovascular profile compared with filtered coffee.
Cafestol specifically blocks intestinal receptors (FXR and HNF-4α) that regulate hepatic cholesterol synthesis and bile acid production. Without a paper filter, these diterpenes pass into the cup; with a paper filter, they are retained in the filter.
Four or five cups a day of unfiltered coffee raise total cholesterol by 6 to 8 mg/dL and LDL by 5 to 7 mg/dL compared with filtered coffee, according to meta-analyses of controlled trials. Homocysteine also rises slightly with sustained consumption.
A Norwegian cohort of 508,747 people followed for about 20 years showed higher cardiovascular mortality in unfiltered coffee drinkers compared with filtered, especially in men over 60. The effect of the brewing method on mortality exceeds the effect of the total amount of coffee.
There is no specific healthy dose; it is a matter of choosing a brewing method. If you drink more than three cups a day, the paper filter is the heart-healthy option. Espresso delivers diterpenes in such a small volume that its impact is smaller.
It does not cause acute toxicity; the risk is chronic and cardiovascular, via elevated LDL. People with high cholesterol, a history of heart disease, or elevated cardiovascular risk benefit most from switching to filtered coffee. In pregnancy and breastfeeding the main limitation is caffeine, not the method.
Yes (can be continued): healthy people with moderate consumption (1-2 cups/day) without dyslipidemia.
No (better to switch to filtered): high daily consumption, high cholesterol, ischemic heart disease, elevated cardiovascular risk, or anyone trying to lower LDL without medication.
It is not the coffee that is the problem but the method. Switching from French press or boiled coffee to paper-filtered coffee lowers cholesterol with zero effort and keeps the benefits of coffee (caffeine, polyphenols, association with lower all-cause mortality). For heavy drinkers, the change is one of the best cost-benefit interventions that exist.
Information, not medical advice. Scientific evidence reflects the quality of the studies.