New Study Finds No Link Between Coffee and High Blood Pressure

High blood pressure doesn’t just raise your risk of heart disease—it’s also tied to stroke and a shorter life. Many people worry their coffee habit might be quietly pushing their blood pressure higher. But is that fear based in fact?

The short answer: a major long-term U.S. study of more than 170,000 people found no clear link between regular coffee drinking and developing high blood pressure—even among those drinking more than five cups per day. Daily intake below one cup and above five cups showed no difference in hypertension risk.

What the 33-Year Study Really Found

Researchers from the Louisiana State University School of Public Health dug into six earlier studies that tracked coffee consumption and health outcomes. Together, those studies followed over 170,000 participants for up to 33 years. Across all that time, roughly 20% of the people studied were eventually diagnosed with high blood pressure.

The key finding? People who drank less than one cup of coffee per day had about the same likelihood of developing hypertension as those who drank more than five cups daily. That flat line across low and high consumption levels is the heart of the study’s conclusion.

But What About One to Three Cups?

Here’s where it gets interesting: the data did show a slightly elevated—but still small—risk of hypertension among people who drank one to three cups of coffee per day when compared to those who drank less. The researchers couldn’t fully explain this bump, calling it an unexpected but minor trend that needs more investigation.

Despite that uptick, the overall pattern held: drinking more than three cups, all the way up to over five cups daily, didn’t correlate with higher hypertension rates. In the dataset, there was no dose-response relationship visible between higher coffee intake and increased risk.

How Was the Research Done?

The scientists didn’t run a new trial themselves. Instead, they performed a meta-analysis—a systematic review and statistical synthesis—of six previous long-term observational studies. These studies had already collected detailed data on participants’ daily coffee intake, ranging from less than one cup to more than five cups daily. Then the original researchers tracked those same individuals for decades, noting who developed hypertension.

The team from LSU pulled all that historical data together and re-analyzed it with a fresh focus on coffee’s possible role in blood pressure outcomes. Their work was published in the peer-reviewed journal Clinical Nutrition.

Frequently Asked Questions

Does drinking coffee really not affect my blood pressure at all?

This study found no significant increase in hypertension risk between people who drank less than one cup of coffee per day and those who drank more than five cups. However, it did note a small, unexplained rise in risk for people drinking one to three cups daily. Overall, the data suggest coffee isn’t strongly linked to developing high blood pressure.

Why might one to three cups of coffee be slightly linked to hypertension?

The researchers observed a slight increase in hypertension risk among people who drank one to three cups per day, but they couldn’t explain why. The effect was small, not seen at higher consumption levels, and requires more research to understand.

How many people were studied, and for how long?

The analysis combined data from six studies involving a total of over 170,000 participants. Those individuals were tracked for up to 33 years, making this one of the longest-running looks at coffee and hypertension risk.

Does this mean I can drink as much coffee as I want without worrying?

Not necessarily. This study looked specifically at hypertension risk. While it found no strong link between coffee and high blood pressure, other health factors could be influenced by very high coffee intake. The study also didn’t explore short-term blood pressure spikes.

What counts as ‘one cup’ in these findings?

The study categorized coffee intake in broad ranges: less than one cup, one to three cups, more than three to five cups, and more than five cups per day. It didn’t specify brew method, size, or strength, just the number of cups typically consumed daily.

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