🟠 Moderate Evidence
The brewing method you choose for your morning coffee has measurable effects on blood cholesterol levels, according to multiple randomized trials and a large observational study. The culprit is cafestol, a fatty molecule in coffee oil that passes through metal mesh and unfiltered brewing methods but is largely trapped by paper filters.
Key takeaways
- Unfiltered coffee raises LDL cholesterol by 5–10 mg/dL in randomized trials—equivalent to adding butter to each cup
- A 20-year Norwegian study of 508,747 people found filter coffee drinkers had 15% lower all-cause mortality
- Unfiltered coffee showed a signal for higher cardiovascular death in men over 60, though overall mortality was neutral
- Paper filters and lighter roasts may reduce cardiovascular risk compared to metal mesh or unfiltered methods
Study at a Glance
| Primary sources | European Journal of Preventive Cardiology, European Journal of Clinical Nutrition, BMJ |
| Study types | Randomized controlled trials, observational cohort study |
| Sample size | RCTs: multiple; Tverdal cohort: 508,747 participants |
| Follow-up | RCTs: acute dosing; Tverdal: 20 years |
| Population | Adults; Norwegian cohort predominantly adult drinkers |
LDL cholesterol impact by brewing method
Change in LDL levels (mg/dL) in randomized trials, compared to no coffee
Source: Cai et al., European Journal of Clinical Nutrition (2012); Urgert et al., BMJ (1996) | Georgian Medical Journal News
Cafestol: the molecule behind the cholesterol effect
Cafestol is a lipid—a fatty compound—that naturally occurs in coffee beans and dissolves into the brewed beverage. When coffee passes through a paper filter, the filter’s fine mesh traps most cafestol molecules, allowing them to be discarded with the grounds. However, metal mesh filters, cloth filters, and unfiltered brewing methods (such as French press, Turkish coffee, or Scandinavian boiled coffee) permit cafestol to pass directly into the cup.
In randomized controlled trials published in the BMJ, consumption of unfiltered coffee raised LDL cholesterol by approximately 5–10 mg/dL. To contextualize: this effect is roughly equivalent to adding 1 tablespoon of butter to each cup, or roughly equivalent to undoing the cholesterol-lowering effect of one low-dose statin tablet. For patients with borderline high cholesterol, this shift could move laboratory values from the desirable range into the high category.
The mechanism appears dose-dependent: studies by Cai and colleagues in the European Journal of Clinical Nutrition (2012) demonstrated that higher consumption of unfiltered coffee produced larger increases in LDL. Paper-filtered coffee, by contrast, showed minimal effect on cholesterol in the same trials.
Long-term mortality: filter coffee linked to 15% survival advantage
A large prospective cohort study provides real-world context for the cholesterol findings. Researchers led by A. Tverdal at the Norwegian Institute of Public Health followed 508,747 Norwegian adults for 20 years, tracking their coffee consumption patterns and health outcomes. Results published in the European Journal of Preventive Cardiology (2020) found that filter coffee drinkers had approximately 15% lower all-cause mortality compared to non-drinkers.
Unfiltered coffee consumption, by contrast, showed a roughly neutral overall mortality effect—neither protective nor harmful on average. However, stratified analysis revealed a subgroup signal: men over 60 who consumed unfiltered coffee had a higher risk of cardiovascular death. The effect in women and younger men was less pronounced. This suggests that the LDL-raising effect of cafestol may carry real clinical consequences, particularly in older men at baseline cardiovascular risk.
Filter coffee drinkers had approximately 15% lower all-cause mortality than non-drinkers over 20 years, while unfiltered coffee showed a signal for higher cardiovascular death in men over 60.
— A. Tverdal and colleagues, Norwegian Institute of Public Health (European Journal of Preventive Cardiology, 2020)
Clinical implications: which brewing method matters most
For individuals with existing hyperlipidemia or cardiovascular disease, the evidence suggests paper-filtered coffee is the safer choice. The American Heart Association recognizes that dietary sources of saturated fat and cholesterol contribute to cardiovascular risk, and the LDL-raising effect of cafestol is measurable and avoidable.
The brewing method effect is large enough to matter clinically but small enough that it need not eliminate coffee drinking entirely. A person consuming 3–4 cups of unfiltered coffee daily could expect an LDL increase in the range of 15–40 mg/dL—substantial enough to influence treatment decisions in borderline cases. Switching to paper-filtered coffee would eliminate this effect.
Lighter roasts may also offer a modest advantage: some evidence suggests that darker roasting reduces cafestol content slightly, though the effect is smaller than the filtering method itself. The combination of paper filter plus lighter roast represents the most conservative approach for cholesterol-conscious consumers. For more on evidence-based nutrition and health, see SheniEkimi’s nutrition explainers.
What this means
Frequently asked questions
Does instant coffee have cafestol?
Instant coffee is made by brewing coffee and then removing the water, leaving a soluble powder. The manufacturing process includes a filtration step that removes most cafestol. Studies in Food & Function (2014) show that instant coffee has minimal cholesterol-raising effects, similar to paper-filtered brewed coffee. It is a safe choice for those concerned about cafestol.
What about espresso?
Espresso is made by forcing hot water through finely ground coffee under pressure. Most espresso machines use a metal basket filter, which does not trap cafestol effectively. Espresso therefore contains significant cafestol and raises LDL cholesterol similarly to other unfiltered methods. However, a single espresso shot is small, so the total cafestol dose is lower than a full cup of French press coffee.
Is the 15% mortality benefit only from paper-filtered coffee?
The 15% mortality benefit found in the Norwegian study compares filter coffee drinkers to non-drinkers. The study did not isolate the filtering method as the sole cause of the benefit—coffee contains hundreds of bioactive compounds including chlorogenic acids and polyphenols with potential health benefits. The lower LDL from filtering may be part of the story, but other protective components of coffee (antioxidants, anti-inflammatory compounds) likely also contribute. This suggests that coffee itself is beneficial, but the brewing method affects its cholesterol impact.
The evidence for a brewing-method effect on cholesterol is now well established in randomized trials, and long-term observational data suggest this translates to real health consequences. For most people, the choice between paper-filtered and unfiltered coffee is a simple dial to turn on cardiovascular risk—a rare situation in dietary epidemiology where a small, specific change can have measurable impact. Whether you are a daily coffee drinker or an occasional consumer, understanding cafestol’s cholesterol effect empowers informed choice about your brewing method and overall heart health strategy.
Source: Tverdal et al., European Journal of Preventive Cardiology, 2020; Urgert et al., BMJ, 1996; Cai et al., European Journal of Clinical Nutrition, 2012
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Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD. Spotted an error? Contact the editorial team.
