Coffee, Blood Pressure and Cholesterol

Coffee and blood pressure: a temporary rise is not the same as hypertension

Blood pressure describes the pressure of blood in your arteries. The systolic reading is the pressure when the heart pumps; the diastolic reading is the pressure between beats. Hypertension means persistently high blood pressure, not simply a higher reading after a drink.

A systematic review by Mesas and colleagues pooled controlled trials involving people with hypertension. Doses of 200 to 300 mg of caffeine increased systolic pressure by an average of about 8 mmHg and diastolic pressure by about 6 mmHg. The increase appeared within the first hour and lasted at least three hours.

These were group averages under trial conditions, not an expected increase for every reader. They also describe a measured caffeine dose, not a standard number of coffees: caffeine content varies with preparation and serving size.

Tolerance helps, but varies between people

Repeated exposure can reduce the response, a process called tolerance. However, a randomised crossover trial found that regular caffeine intake did not eliminate the blood pressure response in all participants. Feeling accustomed to coffee therefore does not prove that your blood pressure is unaffected.

Longer-term evidence asks a different question. A 2023 systematic review of observational studies found that the highest coffee consumption was associated with a slightly lower incidence of hypertension than the lowest consumption. That does not establish that coffee prevents hypertension: observational research cannot fully separate coffee habits from other differences between people.

The findings are not necessarily contradictory. A temporary response after caffeine and the development of hypertension over years are different outcomes, measured using different study designs. For the wider context, start with coffee and health.

Coffee and cholesterol: the role of coffee oil

For cholesterol, the main issue is not caffeine but diterpenes, compounds carried in coffee’s oily fraction. Two commonly discussed examples are cafestol and kahweol. Human experiments led by Urgert and Katan established that cafestol raises total and LDL cholesterol; LDL means low-density lipoprotein, the cholesterol fraction commonly discussed when assessing cardiovascular risk.

The two diterpenes should not be presented as equally potent. In a small randomised trial using isolated compounds, adding kahweol to cafestol produced a smaller additional cholesterol increase that was not statistically conclusive. The strongest evidence identifies cafestol as the main contributor.

There is also direct evidence from drinking coffee rather than taking isolated compounds. In a randomised trial, participants drank 900 ml of strong cafetière or paper-filtered coffee daily for 24 weeks. LDL cholesterol was 0.26 mmol/L higher in the cafetière group relative to the filtered group at the end.

That was substantial daily consumption, not evidence that an occasional cafetière produces the same result. Nevertheless, the trial supports a causal effect on LDL under the conditions studied, rather than merely an association between coffee drinking and cholesterol. It did not measure whether participants subsequently experienced heart attacks.

Filtered versus unfiltered coffee

The filter material matters more than the presence of something called a filter. Paper retains much of the lipid-associated material responsible for the cholesterol effect. A crossover experiment comparing boiled coffee with the same coffee passed through paper found lower total and LDL cholesterol during the paper-filtered periods.

In practical terms:

• Paper-filtered coffee: a sensible preference when reducing exposure to cholesterol-raising coffee oils.
• Cafetière, Turkish and Scandinavian boiled coffee, including kokkaffe: preparations that allow more of those compounds into the drink.
• Espresso and moka: use metal filtration rather than conventional filter paper, so should not automatically be treated as equivalent to paper-filtered coffee. Exposure depends on the brew and total amount consumed.

A small espresso and a large cafetière serving are not interchangeable measures of exposure. Concentration alone is insufficient: the amount in each serving and the number of servings also matter.

What about office machines?

A 2025 laboratory study found higher diterpene concentrations in many sampled Swedish workplace brewing machines than in paper-filtered coffee, with considerable variation between machines and samples. It measured coffee chemistry, not changes in employees’ cholesterol.

The useful workplace question is therefore: “Does this machine use paper filtration, metal filtration or a coffee concentrate?” The study cannot establish the cholesterol effect of every UK bean-to-cup machine, and its modelled health effects should not be mistaken for measured clinical outcomes.

What the evidence can tell us

The strength descriptions below are editorial summaries for the specific claim, not formal clinical evidence grades.

These distinctions matter when reading reassuring or alarming headlines. Evidence about a blood marker does not directly establish the effect on heart attacks or strokes; those broader outcomes belong in coffee and heart health.

How cafestol may alter cholesterol metabolism

The proposed mechanism involves how the body regulates cholesterol and bile acids, substances made from cholesterol that help with digestion. In experimental research, cafestol activated the farnesoid X receptor, abbreviated FXR, and the related pregnane X receptor, or PXR.

In mice, intestinal signalling increased a messenger called FGF15, while expression of genes involved in liver bile acid production fell. This provides a plausible route by which cafestol can alter cholesterol handling. Crucially, these were animal and cellular findings, not a demonstration of the entire pathway in coffee drinkers.

Later laboratory research published in 2024 supported interaction between cafestol and FXR, while describing the cholesterol-raising mechanism as still incompletely clarified. It is therefore too definite to say that both cafestol and kahweol are proven to raise human LDL through intestinal FXR alone. The human cholesterol effect is better established than its complete molecular explanation.

Practical guidance for your next cup

If blood pressure is your concern

Ask your GP or pharmacist whether reducing caffeine would be useful, particularly if your readings remain high. Do not assume that a reading is harmless because you recently drank coffee, or change prescribed treatment on that basis. The NHS notes that hypertension usually has no symptoms and needs measurement to identify it.

For routine home monitoring, follow your clinician’s instructions. NHS patient guidance advises avoiding caffeine for at least 30 minutes beforehand, sitting quietly for five minutes, and supporting your arm. This standardises measurement; it does not mean caffeine’s physiological effect always ends after 30 minutes.

If LDL cholesterol is your concern

Prefer paper-filtered coffee to frequent large servings of unfiltered coffee, and discuss your brewing habits during a cholesterol review. Keep the wider diet in view too: NHS advice includes reducing saturated fat, including foods such as cream and butter. Changing the brewer is one possible adjustment, not a replacement for your overall treatment plan.

Use caffeine benchmarks as limits, not targets

EFSA’s 2015 assessment found no safety concerns for healthy non-pregnant adults consuming up to 400 mg daily, spread through the day, or single doses up to 200 mg. It did not assess safety in people with medical conditions or interactions with medicines. NHS pregnancy guidance advises no more than 200 mg daily from all sources.

For personal advice, speak to a GP, pharmacist or midwife. Read coffee and health risks for the broader cautions. With coffee, blood pressure and cholesterol, choose the adjustment that matches the concern rather than treating every coffee as equivalent.