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James P. Crowley and Professor Erwin Loh About Caffeine and It’s Positive Effects
Professor Erwin Loh/LinkedIn
Nov 12, 2025, 06:27

James P. Crowley and Professor Erwin Loh About Caffeine and It’s Positive Effects

James P. Crowley, Professor of Medicine emeritus at Brown University, reposted Professor Erwin Loh’s post on LinkedIn:

“Caffeine appears to do the opposite of what you might think when it comes to the heart. Scientists have found that a cup of coffee a day actually protects the heart from atrial fibrillation – a condition that can lead to stroke and heart failure.

In the DECAF (Does Eliminating Coffee Avoid Fibrillation) trial, the researchers found that caffeine resulted in a 39% lower risk of recurrent AF events, compared to those who abstained – and they have a few theories as to why this might be the case.

“Coffee increases physical activity which is known to reduce AF,” said senior author Professor Gregory Marcus from the Division of Cardiology at UCSF.

“Caffeine is also a diuretic which could potentially reduce blood pressure and in turn lessen AF risk.

Several other ingredients in coffee also have anti-inflammatory properties that could have positive effects.””

Quoting Professor Erwin Loh’s post:

“Caffeine appears to do the opposite of what you might think when it comes to the heart. Scientists have found that a cup of coffee a day actually protects the heart from atrial fibrillation – a condition that can lead to stroke and heart failure.

In the DECAF (Does Eliminating Coffee Avoid Fibrillation) trial, the researchers found that caffeine resulted in a 39% lower risk of recurrent AF events, compared to those who abstained – and they have a few theories as to why this might be the case.

“Coffee increases physical activity which is known to reduce AF,” said senior author Professor Gregory Marcus from the Division of Cardiology at UCSF. “Caffeine is also a diuretic which could potentially reduce blood pressure and in turn lessen AF risk. Several other ingredients in coffee also have anti-inflammatory properties that could have positive effects.”

Title: Caffeinated Coffee Consumption or Abstinence to Reduce Atrial Fibrillation

Authors: Christopher X. Wong, Christopher C. Cheung, Gabrielle Montenegro, Hannah H. Oo, Isabella J. Peña, Janet J. Tang, Samuel J. Tu, Grace Wall, Thomas A. Dewland, Joshua D. Moss, Edward P. Gerstenfeld, Zian H. Tseng, Henry H. Hsia, Randall J. Lee, Jeffrey E. Olgin, Vasanth Vedantham, Melvin M. Scheinman, Catherine Lee, Prashanthan Sanders, Gregory M. Marcus

James P. Crowley and Professor Erwin Loh About Caffeine and It's Positive Effects

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Caffeine Catherine Lee Christopher C. Cheung Christopher X. Wong coffee is good for you DECAF (Does Eliminating Coffee Avoid Fibrillation) Edward P. Gerstenfeld Gabrielle Montenegro Grace Wall Gregory M. Marcus Hannah H. Oo Health Hematology Hemostasis Hemostasis Today Henry H. Hsia Isabella J. Peña Janet J. Tang Jeffrey E. Olgin Joshua D. Moss Medicine Melvin M. Scheinman Prashanthan Sanders Randall J. Lee Samuel J. Tu Thomas A. Dewland Vasanth Vedantham Zian H. Tseng
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