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Everyone, are you aware of the latest research published in the scientific journal "Nature Communications" in 2026?

This is extremely interesting data from a global team, including University College Cork in Ireland, which thoroughly elucidates the effects of coffee on the brain and gut bacteria, as touched upon in recent reports by ITmedia NEWS and others.

This research not only overturns the conventional wisdom that "the more coffee you drink, the healthier it is," but also proves the surprising potential of decaffeinated (decaf) coffee.

This time, based on this latest data, we will explain the scientific truth about how coffee affects our brain and gut.

Latest Data Reveals the Decisive Difference Between "Caffeinated" and "Decaf"

The study involved a rigorous experiment with 62 healthy adults, comparing those who drank 3-5 cups of coffee a day with those who drank none. After a complete two-week coffee abstinence, participants were given either "caffeinated" or "decaf" coffee for 21 days, without knowing which they were consuming.

The results showed that the presence or absence of caffeine had completely different approaches to the brain.

・Advantages of caffeinated coffee: Reduced anxiety, improved psychological distress.

・Advantages of decaf (caffeine-free) coffee: Improved memory, improved sleep quality, increased motivation for exercise.

Specifically, the group that drank decaf showed improved memory and sleep quality. The fact that decaf has a positive effect on the brain has been reported in animal models for over 10 years, but this human study reaffirmed that even without caffeine, the benefits of coffee (especially components like "cafestol," which activates the transcription factor Nrf2, a commander that protects cells) are effectively at work.

The Risk of Excessive Coffee Consumption Reducing "Gut Protective Substances"

While extremely interesting, data that we must pay attention to also came to light.

Upon examining the stools of people who regularly drink a lot of coffee, it was found that extremely important metabolites for nerve protection, such as "IPA (indole-3-propionic acid)" and "ICA (indole-3-carboxyaldehyde)" produced by gut bacteria from tryptophan, and "GABA (gamma-aminobutyric acid)," which suppresses brain excitation, were reduced.

A decrease in these substances suggests the possibility of the following risks:

・Decrease in IPA: Negative impact on brain cognitive function ・Decrease in GABA: Difficulty in suppressing anxiety

In fact, completely abstaining from coffee for two weeks led to an increase in protective substances like ICA that had been reduced. This means that coffee is not simply "the more you drink, the better it is for you," but rather has a very complex aspect: excessive consumption can reduce important protective substances in the gut and create noise in the brain and mental state.

That's why we pursue a "subtraction strategy."

This study shows how powerfully coffee changes the gut microbiota. Even with decaf, the gut environment is constantly fluctuating, with bacteria like "Veillonella parvula" increasing in the gut of those who drink decaf, regardless of the presence of caffeine.

Because coffee is a beverage that directly affects the gut environment to such an extent, the critical purity of the base beans becomes paramount.

To fully enjoy the positive effects of coffee on the gut-brain axis (anxiety reduction and cognitive support), it is essential to avoid excessive intake, adhere to an appropriate amount tailored to your physical condition, and most importantly, choose "clean beans" that thoroughly eliminate noise such as mold toxins that disrupt the gut environment.

Summary: Incorporate coffee into your life wisely, with data

This study taught us that coffee is not just a simple wake-up drink, but a powerful entity that affects our brain and gut.

・For refreshment or to alleviate anxiety, an appropriate amount of clean caffeinated coffee. ・To protect sleep and enhance memory and motivation for exercise, choose high-quality decaf.

Using coffee lightly and selectively according to your physical condition and goals is the smart biohack of the future.

We will continue to listen to the latest scientific findings and deliver the best cup of coffee to support your mind and body's performance.

References

Nature Communications (2026) Research report on coffee components, gut microbiota, and their effects on cognition and behavior (University College Cork, Ireland)