A new study published in Nature Scientific Reports suggests that both caffeinated and decaffeinated coffee can influence mental health by modifying the gut microbiome, the community of bacteria residing in the digestive tract. Researchers found that coffee drinkers—regardless of caffeine content—experienced lower stress levels and improved mood, indicating that compounds beyond caffeine may play a role in these benefits.

How Coffee Affects the Gut-Brain Connection

The gut-brain axis, a bidirectional communication network between the digestive system and the brain, is increasingly recognized for its role in regulating emotions, cognition, and stress responses. Coffee’s polyphenols and other bioactive compounds appear to interact with gut bacteria, increasing populations linked to digestion, immunity, and emotional regulation. Decaffeinated coffee was particularly associated with enhanced learning and memory, while caffeinated coffee showed stronger effects in reducing anxiety and inflammation.

The study analyzed data from 34 participants who consumed either caffeinated or decaffeinated coffee daily over four weeks. Blood and stool samples were collected to measure changes in gut bacteria, inflammation markers, and cognitive function. Results indicated that coffee drinkers—especially those consuming decaf—showed improvements in memory tasks and mood assessments compared to a control group that avoided coffee entirely.

Why Caffeine Isn’t the Only Player

While caffeine is often credited for coffee’s stimulating effects, this research suggests that polyphenols and other non-caffeine compounds are key drivers of the observed benefits. Polyphenols are plant-based antioxidants that may reduce inflammation and support gut health. The study’s authors hypothesize that these compounds enhance communication between gut bacteria and the brain, potentially explaining the mood and cognitive improvements reported by participants.

Experts not involved in the study note that coffee’s impact on the gut microbiome could offer new avenues for managing stress and mental health disorders. Dr. John Bienenstock, a gastroenterologist at McMaster University, emphasized that the findings align with growing evidence that gut health is intricately linked to brain function. “The gut isn’t just for digestion—it’s a major player in our overall well-being,” he said.

Broader Implications for Coffee Drinkers

The findings could reshape how people view their daily coffee habit, particularly for those who avoid caffeine due to health concerns. Decaffeinated coffee may offer mental health benefits without the jitters or sleep disruption associated with caffeine. Meanwhile, caffeinated coffee could provide a dual boost—enhancing alertness while simultaneously reducing inflammation and anxiety.

Researchers caution that more studies are needed to confirm these effects and determine optimal consumption levels. However, the initial results suggest that coffee, in moderation, may be a simple and accessible tool for improving mental well-being. For those who already enjoy coffee, the study provides another reason to savor their morning brew—caffeine or not.

What You Need to Know

  • Source: Healthline
  • Published: May 16, 2026 at 10:30 UTC
  • Category: Health
  • Topics: #health · #wellness · #medicine · #sports · #nfl · #american-football

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Curated by GlobalBR News · May 16, 2026

🇧🇷 Resumo em Português

Um simples cafezinho pela manhã pode ser mais do que um hábito reconfortante: pode ser um aliado invisível contra o estresse e a ansiedade. Segundo uma pesquisa recente, tanto o café tradicional quanto o descafeinado podem melhorar o humor e reduzir os níveis de estresse ao promover mudanças positivas na microbiota intestinal, aquele universo microscópico de bactérias que habita nosso sistema digestivo.

O estudo, publicado em meio científico, reforça a crescente evidência de que a saúde intestinal está diretamente ligada ao bem-estar mental — um campo conhecido como eixo intestino-cérebro. No Brasil, onde o café é um símbolo cultural e a ansiedade atinge cerca de 9% da população adulta, segundo a OMS, a descoberta ganha relevância especial. Além de ser uma bebida acessível e amplamente consumida, a pesquisa sugere que até mesmo a versão sem cafeína pode trazer benefícios, o que amplia as possibilidades para quem evita a cafeína por questões de saúde ou preferência pessoal.

Os próximos passos da ciência incluem aprofundar como esses microrganismos interagem com os compostos do café e avaliar se os efeitos se mantêm em longo prazo. Enquanto isso, aquele cafezinho do fim de tarde pode ser mais um motivo para relaxar — sem culpa.

🇪🇸 Resumen en Español

La ciencia acaba de darle un espaldarazo más al ritual matutino favorito de millones: un estudio reciente revela que tanto el café normal como el descafeinado podrían aliviar el estrés y mejorar el ánimo al modificar la flora intestinal.

Investigadores han descubierto que los compuestos del café, como los polifenoles y otros elementos bioactivos, promueven el crecimiento de bacterias beneficiosas en el intestino, lo que a su vez influye en la producción de neurotransmisores clave como la serotonina y el GABA, vinculados al bienestar emocional. Este hallazgo, publicado en Nutrients, sugiere que incluso quienes optan por evitar la cafeína pueden beneficiarse de sus efectos prebióticos, abriendo nuevas perspectivas para el manejo del estrés y la ansiedad desde la alimentación. Para los hispanohablantes, acostumbrados a una cultura cafeteril arraigada, la noticia no solo refuerza un hábito social y gastronómico, sino que también invita a repensar su consumo con un enfoque más saludable.