Everyone has a reason to drink coffee these days, from the caffeine to the taste to the habit to the status symbol of your favorite coffee bar. This study on habitual coffee intake, the gut microbiome, and cognition provides another reason for the health conscious among us: it found benefits for our GI tract that correlate with improvements in mood and cognition.
The Gut-Brain Axis Background
As new tools for research have become available, medical science has uncovered more and more ways in which the billions of bacteria in our guts affect our brain function, in terms of both mental health and cognitive function. Whether through nutritional impact, blood-born chemical effects, immune influences, or effects directly on our gut nervous system, the 3 to 5 pounds of bacteria in our colon shape our lives in more ways than we ever knew.
How Coffee Enters the Picture
Centuries of experience with coffee have produced more opinions and more arguments for coffee’s health benefits than this article can cover. To put some evidence behind the centuries of claims, these researchers looked at how coffee affected bacteria in our GI tract and what turned up on symptom surveys in comparing non-drinkers to coffee drinkers, as well as comparing caffeinated to decaf.
The Study
They took 31 coffee drinkers and compared them to 31 non-drinkers in terms of psychological assessments and measured both stool and urine samples over time they considered coffee drinkers as those who consumed 3-5 cups of coffee per day.
After initial assessments, the coffee drinkers had to stop drinking for 2 weeks while gut metabolites were measured, measurements which revealed shifts in gut bacteria. At that point, half of the prior coffee drinkers were given caffeinated coffee and half were given decaf, with a blind selection process.
The study showed several interesting findings. First, certain species of bacteria were higher in coffee drinkers than non-drinkers. Second, learning and memory improvements occurred more in the decaf group while reduced anxiety and better attention occurred in the caffeine group, as well as a lower risk of inflammation.
Takeaways
In helping our patient restore and maintain healthier, more abundant lives at Sanctuary Functional Medicine, some find coffee to be both enjoyable and symptomatically beneficial. This study supports those subjective senses with some objective data. While this may not change your coffee habits very much, it does offer some encouragement for coffee drinkers as they drink their next cup of joe. As long as your mug is not filled with extra sugar or other inflammatory ingredients found in many coffee bar offerings, the basic coffee is likely supporting both gut health and brain health.
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Original Article:
Serena Boscaini, Thomaz F. S. Bastiaanssen, Gerard M. Moloney, Federica Bergamo, Laila Zeraik, Caroline O’Leary, Aimone Ferri, Maha Irfan, Maaike van der Rhee, Thaïs I. F. Lindemann, Elizabeth Schneider, Arthi Chinna Meyyappan, Kirsten Berding Harold, Caitríona M. Long-Smith, Carina Carbia, Kenneth J. O’Riordan, José Fernando Rinaldi de Alvarenga, Nicole Tosi, Daniele Del Rio, Alice Rosi, Letizia Bresciani, Pedro Mena, Gerard Clarke, John F. Cryan. Habitual coffee intake shapes the gut microbiome and modifies host physiology and cognition. Nature Communications, 2026; 17 (1) DOI: https://doi.org/10.1038/s41467-026-71264-8
Thanks to Science Daily:
University College Cork. “Scientists just discovered what coffee is really doing to your gut and brain.” ScienceDaily. ScienceDaily, 3 May 2026. https://www.sciencedaily.com/releases/2026/05/260502233911.htm
Sanctuary Functional Medicine, under the direction of Dr Eric Potter, IFMCP MD, provides functional medicine services to Nashville, Middle Tennessee and beyond. We frequently treat patients from Kentucky, Alabama, Mississippi, Georgia, Ohio, Indiana, and more... offering the hope of healthier more abundant lives to those with chronic illness.
