A reader recently wrote in with a question I hear constantly: "I switched from drip to French press last year and my LDL went up at my next physical. Is that a coincidence, or is my coffee actually doing this?" It turns out this is one of the more well-documented, and least talked about, connections in everyday nutrition. The short answer: it's probably not a coincidence, and the reason has almost nothing to do with the coffee bean itself.
The Myth: "Coffee Is Coffee, However You Brew It"
Most people assume that beans, roast level, and caffeine content are what determine coffee's health effects. In reality, one of coffee's most significant cardiovascular effects has almost nothing to do with any of those factors, and everything to do with a small oily compound most drinkers have never heard of: cafestol.
Cafestol is a diterpene naturally present in coffee oils. It's been studied for decades, and the research is remarkably consistent: cafestol raises LDL cholesterol by interfering with how the liver regulates its own cholesterol production. The catch is that how much cafestol reaches your cup depends almost entirely on brewing method, not on whether you bought a fancy single-origin bag or a supermarket blend.
The Fact: Your Filter Is Doing More Work Than You Think
Paper filters are unusually good at trapping cafestol and its companion compound, kahweol, before they ever reach your mug. Skip the paper filter, and much more of these compounds pass straight through.
Here's how that plays out across common brewing methods:
| Brewing Method | Cafestol Content | Cholesterol Impact |
|---|---|---|
| Drip coffee (paper filter) | Very low | Minimal to no effect on LDL |
| Espresso | Moderate | Small effect, due to short brew time and small serving size |
| French press | High | Can meaningfully raise LDL with regular, heavy use |
| Turkish or boiled coffee | Very high | Most strongly associated with elevated cholesterol in studies |
| Instant coffee | Very low | Minimal effect, similar to filtered coffee |
Some of the clearest evidence on this comes from Scandinavia, where boiled, unfiltered coffee has long been part of daily life. Studies out of Norway and Finland found that people who regularly drank unfiltered, boiled coffee had measurably higher total and LDL cholesterol than filtered-coffee drinkers, with an effect large enough to matter clinically among heavy daily drinkers.
The Myth: "If It Raises Cholesterol, It Must Be Bad for My Heart Overall"
This is where the story gets more interesting than a simple warning label would suggest. Coffee isn't a one-dimensional villain here.
For someone drinking several cups of unfiltered coffee daily over a long period, studies have found LDL increases in a modest but measurable range, enough to show up on a lipid panel, though generally not enough on its own to be considered a major cardiovascular risk factor for most healthy adults. The effect also appears to be dose-dependent: the more unfiltered coffee, and the longer the habit, the larger the shift.
Meanwhile, coffee is also rich in polyphenols and antioxidants. Several large observational studies have linked moderate coffee consumption, generally three to four cups per day, with a lower risk of type 2 diabetes, and in some analyses, a modestly lower overall cardiovascular risk. So the same beverage can carry a specific, brewing-dependent cholesterol effect and broader metabolic benefits at the same time. That's exactly why nutrition guidance on coffee tends to avoid simple "good" or "bad" verdicts.
The Fact Most People Miss: It's Often Not the Coffee, It's the Add-Ins
For a lot of coffee drinkers, what goes into the cup matters more than the coffee itself. Regularly adding heavy cream, whole milk, flavored syrups, or sugar can meaningfully add to saturated fat and calorie intake over time, an effect on LDL cholesterol and weight that's more direct and better established than cafestol exposure. A daily specialty drink loaded with whipped cream and syrup is a very different nutritional item than a plain black filtered coffee, no matter how either one was brewed.
The Myth: "Decaf Solves the Problem"
Not quite. Cafestol has nothing to do with caffeine content, so an unfiltered decaf coffee carries essentially the same cholesterol consideration as an unfiltered regular coffee. If brewing method is the concern, switching to decaf without changing how it's brewed won't fix it.
What Actually Helps
- If you're a heavy daily coffee drinker, using a paper filter removes most of the cholesterol concern in one simple switch
- French press and Turkish coffee aren't dangerous in moderation; the effect matters most for people drinking several cups a day, day after day, over months or years
- Add-ins like cream, sugar, and flavored syrups are likely to move your lipid panel more than the brewing method itself
- If you already have elevated LDL, switching brewing methods is a low-effort change that studies suggest can help within weeks
Where This Leaves the Original Question
Back to that reader's question: switching from drip to French press is a very plausible explanation for an LDL bump on a follow-up lipid panel, especially with regular, daily use. It's not a guaranteed cause, since diet, weight, and other habits could also shift in the same window, but it's a documented, well-studied mechanism, and one of the easier variables to test by simply switching back and rechecking labs in a few months.
Q: Should I stop drinking French press or espresso completely?
Not necessarily. For most people with normal cholesterol drinking one or two cups a day, the effect is small. The concern applies mainly to people who already have elevated LDL or who drink several cups of unfiltered coffee daily.
Q: Does espresso count as filtered or unfiltered coffee?
Espresso uses a metal filter rather than paper, so some cafestol passes through, but the short brew time and small serving size keep overall exposure much lower than French press or boiled coffee.
References
- Jee SH, He J, Appel LJ, Whelton PK, Suh I, Klag MJ. Coffee Consumption and Serum Lipids: A Meta-Analysis of Randomized Controlled Clinical Trials. American Journal of Epidemiology. 2001;153(4):353-362. academic.oup.com/aje/article/153/4/353/129046
- Tverdal A, Selmer R, Cohen JM, Thelle DS. Coffee Consumption and Mortality From Cardiovascular Diseases and Total Mortality: Does the Brewing Method Matter? European Journal of Preventive Cardiology. 2020;27(18):1986-1993. doi.org/10.1177/2047487320914443
- Orrje E, Fristedt R, Rosqvist F, Landberg R, Iggman D. Cafestol and Kahweol Concentrations in Workplace Machine Coffee Compared With Conventional Brewing Methods. Nutrition, Metabolism and Cardiovascular Diseases. 2025. sciencedirect.com/science/article/pii/S0939475325000870
- Harvard T.H. Chan School of Public Health. Coffee. The Nutrition Source. nutritionsource.hsph.harvard.edu/food-features/coffee