Unfiltered coffee is any coffee brewed without a paper filter, meaning the natural oils and fine grounds from the beans end up in your cup. French press, Turkish coffee, moka pot, and boiled coffee all fall into this category. The key difference from filtered coffee isn’t just texture or taste. It’s chemical: a cup of unfiltered coffee contains roughly 30 times more cholesterol-raising compounds than a cup that passes through a paper filter.
Common Unfiltered Brewing Methods
The most popular unfiltered method is the French press, which steeps coarse grounds in hot water and uses a metal mesh plunger to separate them. The mesh catches large particles but lets oils and fine sediment through. Turkish coffee takes things further: finely ground beans are simmered in a small copper pot called a cezve, and the grounds settle to the bottom of the cup. You actually consume some of that sediment as you drink.
Moka pots, the stovetop brewers common in Italian households, use pressurized steam to push water through coffee grounds. There’s a metal filter basket, but no paper. Percolators work similarly, cycling hot water through grounds repeatedly with no paper barrier. Even espresso sits in a gray area. It’s forced through a metal portafilter at high pressure, and while serving sizes are small, individual shots can contain surprisingly high levels of coffee oils.
What Makes It Different: Coffee Oils and Diterpenes
Coffee beans naturally contain oily compounds called diterpenes, the two most studied being cafestol and kahweol. These are what give unfiltered coffee its heavier body, richer mouthfeel, and slightly viscous texture. Paper filters absorb the vast majority of these oils. A cup of paper-filtered coffee retains only about 0.02 mg of cafestol and kahweol each, while a cup of boiled coffee contains around 7.2 mg of each.
Lab measurements show the range clearly. Paper-filtered coffee contains about 12 mg/L of cafestol, while French press and percolator coffee contain around 90 mg/L. Boiled coffee, the kind traditionally made in Scandinavian countries, reaches 939 mg/L. Espresso is wildly variable: some samples measured as high as 2,447 mg/L of cafestol, though the small serving size (about 30 mL) means total intake per shot is lower than that number suggests. Pouring boiled coffee through even a simple fabric filter drops cafestol from 939 to 28 mg/L, which illustrates how effective any filtration barrier is at trapping these oils.
How Unfiltered Coffee Raises Cholesterol
Cafestol is one of the most potent cholesterol-raising compounds found in food. It works by interfering with your liver’s ability to process and remove cholesterol from the bloodstream. Normally, your liver converts excess cholesterol into bile acids, which are then excreted. Cafestol blocks the enzyme responsible for that conversion and also reduces the number of receptors your liver uses to pull LDL cholesterol out of your blood.
The result is measurable. Data from a large U.S. health survey covering 2005 to 2020 found that each additional cup of coffee per day was associated with a 1.22 mg/dL increase in LDL cholesterol. For people drinking three or more cups daily, the effect was steeper: each extra cup was linked to a 7.86 mg/dL increase in LDL and an 8.45 mg/dL increase in total cholesterol compared to non-drinkers. These numbers reflect all coffee types, but the effect is driven primarily by diterpenes in unfiltered preparations. Filtered coffee does not significantly change LDL or triglyceride levels.
Where Espresso Fits
Espresso is technically unfiltered, since it passes through metal rather than paper. But its place on the health spectrum is complicated. The diterpene concentration per liter can be extremely high, yet a standard espresso shot is only about one ounce. A French press user might drink 12 to 16 ounces in a sitting. So total diterpene exposure depends heavily on how many espresso-based drinks you consume daily. One or two shots likely deliver far less cafestol than three cups of French press coffee. Six or seven shots of espresso throughout the day, however, could push your intake into the range that affects cholesterol.
The Tradeoff: What You Gain
Coffee contains hundreds of biologically active compounds beyond diterpenes, including chlorogenic acids, lignans, and magnesium. These substances can reduce inflammation and improve insulin sensitivity. Moderate coffee consumption overall is associated with lower rates of heart disease, heart failure, and death from cardiovascular causes. That’s true even for unfiltered coffee, which makes the picture complicated. The cholesterol-raising effect of cafestol is real and consistent, but coffee’s other compounds may partially offset the cardiovascular risk.
Researchers examining large cohorts have acknowledged this tension directly: because coffee contains so many beneficial compounds alongside the problematic diterpenes, the net effect of drinking unfiltered coffee on heart disease remains uncertain. The clearest takeaway is that paper-filtered coffee gives you the antioxidants and anti-inflammatory benefits while removing almost all of the cholesterol-raising oils.
Practical Considerations
If your cholesterol levels are normal and you drink one or two cups of French press coffee a day, the impact on your lipids is relatively small. The concern grows with volume. Three or more daily cups of unfiltered coffee can meaningfully shift your LDL numbers over time, particularly if your cholesterol is already elevated.
There’s no official guideline on how many cups of unfiltered coffee are safe. Medical reviews consistently note that no consensus exists on the ideal type or amount of coffee for cardiovascular health. What is clear is that preparation method matters. If you love the ritual of a French press but want to minimize diterpene exposure, one simple option is to pour your brewed coffee through a paper filter before drinking it. This removes most of the oils while preserving the flavor compounds that make it through the paper. For Turkish coffee, where the sediment is part of the experience, that workaround doesn’t really apply, so keeping your intake moderate is the more practical strategy.