Coffee drinkers have a richer intestinal microbiota than non-drinkers
Durante siglos, el café ha sido comprendido como un estimulante, un ritual de despertar. Ahora, un estudio internacional con más de 22.000 participantes publicado en Nature sugiere que su influencia más profunda ocurre en silencio, en el interior del intestino, donde sus compuestos vegetales moldean el ecosistema microbiano que regula la salud metabólica y cardiovascular. Lo que bebemos cada mañana, al parecer, nos transforma de maneras que apenas comenzamos a comprender.
- Un análisis de microbiomas en 25 países revela que los bebedores de café albergan más de 100 especies bacterianas asociadas al consumo, dibujando una huella intestinal inconfundible.
- La bacteria Lawsonibacter asaccharolyticus aparece entre 6 y 8 veces más en consumidores habituales, como si el café activara un organismo que espera latente en el intestino.
- El descubrimiento de que el café descafeinado produce efectos similares sacude la creencia popular: no es la cafeína la responsable, sino los polifenoles, compuestos vegetales que interactúan directamente con la microbiota.
- La enfermedad cardiovascular sigue siendo una de las principales causas de muerte prematura en el mundo, lo que convierte cualquier hábito cotidiano vinculado a mejores marcadores cardiometabólicos en objeto de urgente atención científica.
- La microbiota intestinal se consolida como indicador clave del bienestar metabólico y cardiovascular, y este estudio podría redefinir las recomendaciones dietéticas sobre el consumo diario de café.
Millones de personas toman café cada mañana sin preguntarse qué ocurre después en su interior. Durante mucho tiempo, la ciencia se centró en la cafeína: su efecto estimulante, sus límites seguros, su relación con el corazón. La Asociación Americana del Corazón considera moderado su consumo, y la FDA establece en torno a 400 miligramos la tolerancia diaria para adultos sanos. Pero un estudio reciente publicado en Nature propone que la historia más importante del café no tiene que ver con el despertar, sino con lo que sucede en el intestino.
El médico y divulgador Tim Spector, especialista en microbiota intestinal, participó en una investigación que analizó los microbiomas de más de 22.000 personas en 25 países. Los resultados revelaron una huella clara: los bebedores de café presentan una microbiota intestinal más rica y diversa que los no consumidores, con más de 100 especies bacterianas asociadas al consumo. Entre ellas destaca Lawsonibacter asaccharolyticus, que aparece entre 6 y 8 veces más en quienes beben café con regularidad, como si el contacto con la bebida activara un organismo que aguarda latente.
Lo que resultó especialmente revelador fue la inclusión de personas que consumían café descafeinado, quienes mostraron patrones similares. Esto llevó a Spector a concluir que los beneficios no provienen de la cafeína, sino de los polifenoles y otros compuestos vegetales presentes en el café, que interactúan directamente con el ecosistema microbiano. El estímulo que creíamos conocer resulta ser, quizás, el efecto más superficial de una bebida cuya influencia más profunda ocurre en silencio, célula a célula, cada mañana.
Millions of people start their morning with coffee without giving much thought to what happens inside their bodies afterward. But that daily ritual has been under scientific scrutiny for years, and the findings are becoming harder to ignore. The American Heart Association has long held that moderate coffee consumption is safe for the heart, and the FDA sets the daily caffeine tolerance for most healthy adults at around 400 milligrams. These aren't trivial details. Cardiovascular disease remains one of the world's leading threats to public health, accounting for a significant share of premature deaths according to the World Health Organization. Any everyday habit linked to better heart and metabolic markers naturally draws the attention of researchers and physicians.
Coffee, increasingly, is no longer viewed simply as a stimulant. Scientists are paying closer attention to how it relates to diet, metabolism, and the gut microbiota—that ecosystem of microorganisms that influences crucial bodily functions and has become one of the most closely watched fields in nutrition research today. Tim Spector, a physician and communicator specializing in intestinal microbiota, has been among those making the case that coffee drinkers tend to show better cardiovascular health markers. His reasoning draws on research published in Nature, in which he participated, examining how coffee relates to the gut microbes of thousands of people.
The study analyzed microbiome data from more than 22,000 people across 25 countries. What emerged was a clear fingerprint of coffee in the intestine. The research team identified more than 100 bacterial species associated with coffee consumption. This led Spector to conclude that coffee drinkers possess a richer intestinal microbiota than non-drinkers. One microorganism stood out above the rest: Lawsonibacter asaccharolyticus appeared between 6 and 8 times more frequently in regular coffee consumers. Spector notes that this bacterium is typically present in the intestines of non-coffee drinkers as well, essentially waiting for contact with the beverage to activate and multiply.
What makes the findings particularly striking is what they reveal about the source of coffee's benefits. The study included people who drank decaffeinated coffee, and they showed similar patterns. This observation proved crucial to interpreting the results. According to Spector, the health effects do not come from caffeine itself but from coffee's rich mixture of plant compounds, particularly polyphenols. The benefits, in other words, stem not from the classical stimulant effect but from the beverage's chemical composition and how it interacts with the gut microbiota.
The implications extend beyond morning routines. Cardiovascular disease continues to be a major public health concern, and any daily habit that correlates with better cardiometabolic indicators attracts growing scientific interest. As researchers increasingly focus on how everyday choices affect heart and metabolic health, the gut microbiota has emerged as a key indicator of overall wellness. The coffee study suggests that what we thought we knew about this simple beverage—that it wakes us up—may have been missing the more profound story happening beneath the surface.
Citas Notables
Coffee drinkers have a microbiome intestinal more rich than non-drinkers— Tim Spector, physician and microbiota researcher
The health effects do not come from caffeine, but from coffee's rich mixture of plant compounds, particularly polyphenols— Tim Spector
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that coffee drinkers have more bacterial species in their gut? Isn't diversity always good?
Diversity in the microbiota generally correlates with better metabolic and cardiovascular health. More species means more metabolic flexibility—your body can handle different foods and stressors more effectively. It's not just about having bacteria; it's about having the right ecosystem.
But the study found over 100 species linked to coffee. That seems like a lot. Are all of them beneficial?
The study identified the associations, not necessarily the benefit of each individual species. What matters is that coffee consumption creates conditions where these species thrive together. Lawsonibacter asaccharolyticus is the standout—it appears 6 to 8 times more frequently in coffee drinkers—but the real story is the overall shift in the microbial landscape.
If decaffeinated coffee shows the same effect, why do people still drink regular coffee?
Habit, taste, and the immediate alertness caffeine provides. But from a microbiota perspective, you're right—the polyphenols do the heavy lifting for gut health. That's actually liberating information for people who are sensitive to caffeine or who want the health benefits without the stimulation.
How confident are researchers that this correlation means causation? Could coffee drinkers just be healthier people overall?
That's the right skepticism. The study is observational, so we can't rule out confounding factors. But the fact that the effect appears across 25 countries and 22,000 people, and that it holds even for decaffeinated coffee, suggests something real is happening. Still, more research is needed to prove causation definitively.
What happens next? Will doctors start recommending coffee for heart health?
Possibly, but carefully. The American Heart Association already says moderate coffee consumption is safe. This research adds a mechanism—the microbiota pathway—that could strengthen those recommendations. But public health messaging moves slowly, and they'll want to see replication and longer-term studies first.