Scientists find coffee alters gut bacteria and improves mood and cognition

5 articles · Updated · ScienceDaily · May 3

At University College Cork, a Nature Communications study of 62 people found regular coffee drinkers had distinct microbiome changes after a two-week abstinence and reintroduction phase.
Both caffeinated and decaf coffee were linked to lower stress, depression and impulsivity, while decaf alone improved learning and memory and caffeine alone reduced anxiety and sharpened attention.
Researchers said the findings clarify coffee’s effects on the gut-brain axis, suggesting compounds beyond caffeine, including polyphenols, may help shape microbes, metabolism and emotional wellbeing.

Could the secret to better mood and sharper memory lie in your morning coffee, even if it's decaf—and what role do your gut microbes play?

If coffee changes your gut and mind, could other everyday foods hold untapped powers for mental health—or hidden risks for sensitive individuals?