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Your daily coffee habit may affect your brain and mood in unexpected ways, study finds

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Bardolf, D. (2026, October 31). Your daily coffee habit may affect your brain and mood in unexpected ways, study finds. Fox News. https://www.foxnews.com/food-drink/daily-coffee-habit-affect-brain-mood-unexpected-ways-study-finds

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Fox News · collected 2026-10-31 · by Deirdre Bardolf

Quick Summary

A study conducted by University College Cork found that both caffeinated and decaffeinated coffee affect gut microbes and certain aspects of mood, though their impacts on cognition differ. The research involved 62 participants, divided into regular coffee drinkers and non-drinkers; the former stopped drinking for two weeks before being assigned to consume either caffeinated or decaf coffee for three more weeks. Regular coffee consumption was associated with lower stress, depression, and impulsivity levels, while caffeine specifically reduced anxiety and improved attention test scores, whereas decaffeinated coffee enhanced episodic memory performance. However, a clinical psychologist cautions that these findings may not translate into significant real-world improvements in cognitive function or mental health.
Written by AI on 2026-11-01, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

A recent small study from University College Cork in Ireland found that daily coffee consumption, whether caffeinated or decaffeinated, can affect gut microbes and mood. The study involved 62 healthy adults, half of whom were regular coffee drinkers consuming three to five cups a day. After a two-week abstinence period, participants resumed drinking either caffeinated or decaf coffee for three weeks. During this time, both groups reported reduced stress, depression, and impulsivity compared to before the study began. The research suggests that coffee influences health through complex interactions with gut microbes and metabolism beyond just its caffeine content.

Written for “Coffee Effects on Brain Mood” on 2026-11-01, grounded in this article and the 0 other(s) covering the same event.

Story

📰 Coffee Effects on Brain Mood
Health · 1 article(s) covering the same event.

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Claims extracted
21
sentences that state something as happening or true
Uncertain
24%
5 of 21 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
69/100
Fox News's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Health
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-11-01 · how these are computed

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Source leaning vs. consistency

Publisher

Fox News · 6161 article(s) · 11 correction(s) detected
Running correction rate · 11 correction(s)

Who wrote this

Deirdre Bardolf
38 article(s) here · 1 carrying a prediction
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Also by Deirdre Bardolf
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Topics

Fox News Digital Ireland New York University College Cork

Subjects

Cryan PERSON · 2× Fox News Digital ORG · 2× Steele PERSON · 2× Ireland GPE · 1× John Cryan PERSON · 1× New York GPE · 1× Rebecca Steele PERSON · 1× University College Cork ORG · 1×

Narrative

While Steele said the decaf group’s memory results are interesting, changes in sleep and physical activity, along with the possibility of a "learning effect" from taking the same tests more than once, complicate the findings.
framing: mixed · carried by 1 article(s) · first seen 2026-11-01
🔮 Your daily cup of coffee may be doing more than helping you wake up in the morning, a new study has found.

Claims (21 extracted, 5 hedged)

Your daily cup of coffee may be doing more than helping you wake up in the morning, a new study has found. uncertain
study → do → morning
A small study out of University College Cork in Ireland found that both caffeinated and decaffeinated coffee were linked to changes in gut microbes and some measures of mood. asserted
coffee → find → mood
Both types also appeared to have different effects on cognition. asserted
types → appear → cognition
"Coffee is more than just caffeine — it’s a complex dietary factor that interacts with our gut microbes, our metabolism and even our emotional wellbeing," study corresponding author Professor John Cryan said in a statement. asserted
Cryan → ’ → statement
Caffeinated and decaffeinated coffee may influence health "in distinct but complementary ways," Cryan added. uncertain
Cryan → decaffeinate → ways
The researchers studied 62 healthy adults, 31 who were regular coffee drinkers and 31 who did not drink coffee. asserted
who → study → coffee
The coffee drinkers, who typically had three to five cups a day, stopped drinking it for two weeks; then they were assigned to resume caffeinated or decaf coffee for three weeks. asserted
they → have → weeks
Researchers then tracked their mood and cognitive test scores and analyzed stool and urine samples. asserted
Researchers → track → samples
After coffee was reintroduced, both groups reported lower stress, depression and impulsivity than at the the start of the study. asserted
groups → reintroduce → study
The caffeinated group also reported reduced anxiety and showed improvement on an attention test. asserted
group → report → test
Those who drank decaf showed improvement on a test of episodic memory, which measures the ability to recall information and experiences. asserted
which → drink → information
The researchers found that coffee drinkers also had differences in certain gut bacteria and both groups had some microbial changes after starting both types of coffee, though the study could not prove gut microbes caused the reported mood or cognitive changes. "Public interest in gut health has risen hugely," Cryan said. uncertain
Cryan → find → health
"The relationship between digestive and mental health is also increasingly being better understood, but the mechanisms behind coffee’s effects on this gut-brain axis have remained unclear. uncertain
mechanisms → understand → axis
" The study had some additional limitations, noted Rebecca Steele, Ph.D., a New York-based clinical psychologist who was not involved in the research. asserted
who → have → research
People should be cautious about drawing broad conclusions from a small sample, Steele told Fox News Digital. asserted
Steele → draw → Digital
Gains on cognitive tests do not necessarily translate into meaningful or lasting improvements in everyday life, she added. asserted
she → translate → life
"How I perform with a paper-and-pen test might not be the same way that I perform when I’m out in the real world," she said. uncertain
she → perform → world
Research has found short-term effects of caffeine on alertness, but evidence about its long-term effects on cognition remains inconclusive, she also said. asserted
she → find → cognition
While Steele said the decaf group’s memory results are interesting, changes in sleep and physical activity, along with the possibility of a "learning effect" from taking the same tests more than once, complicate the findings. asserted
changes → say → findings
"Changes in self-reported stress and depression scores should not be confused with evidence that coffee treats clinical depression," she also cautioned. asserted
she → report → depression
Fox News Digital reached out to the researchers for additional comment and information. asserted
Digital → reach → comment
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