The cell's ability to eliminate waste and recycle its own components
En los laboratorios de la Universidad de Buenos Aires, científicos llevan una década explorando si el mate —bebida que estructura la vida social argentina— podría también proteger al cerebro del Parkinson, una de las enfermedades más devastadoras del sistema nervioso. El equipo del biólogo Juan Ferrario ha documentado que el extracto de yerba mate reduce la muerte de neuronas dopaminérgicas en modelos animales y activa la autofagia, el mecanismo celular que elimina desechos acumulados. Lo que comenzó como una correlación epidemiológica se ha convertido en una hipótesis biológica con mecanismo identificado, recordándonos que las respuestas a grandes preguntas médicas a veces se esconden en los gestos más cotidianos de una cultura.
- El Parkinson destruye neuronas dopaminérgicas de forma progresiva e irreversible, y la ciencia aún no cuenta con formas de prevenirlo ni detenerlo en humanos.
- Tres estudios epidemiológicos independientes han encontrado que quienes toman mate regularmente presentan tasas más bajas de Parkinson, una correlación inversa que encendió la alarma científica.
- Los experimentos en modelos murinos muestran que el extracto de yerba mate reduce el daño celular en aproximadamente un 12% y estimula la autofagia, el sistema de limpieza interno de las neuronas que falla en el Parkinson.
- El ácido clorogénico, que representa el 40% de la composición química del mate, activa la enzima AMPK y supera en potencia neuroprotectora a compuestos de referencia como el Trolox.
- Los hallazgos siguen siendo preliminares: no hay ensayos clínicos en humanos completados ni publicaciones en grandes revistas internacionales, y el paso del laboratorio a la clínica es el desafío pendiente.
En los laboratorios de la Universidad de Buenos Aires, un equipo liderado por el biólogo Juan Ferrario lleva una década investigando si la yerba mate —omnipresente en la vida cotidiana argentina— podría proteger al cerebro del Parkinson. La pregunta surgió de un hallazgo epidemiológico: en 2015, la investigadora Emilia Gatto analizó más de 600 personas y encontró que quienes tomaban mate regularmente presentaban menores tasas de la enfermedad. Ferrario, con 25 años de experiencia en neuroprotección, decidió replicar esa hipótesis en sus propios modelos.
En 2019, el equipo publicó en Movement Disorders que el extracto de yerba mate extendía la supervivencia de las neuronas dopaminérgicas, las células que el Parkinson destruye de forma selectiva. Experimentos posteriores en ratones confirmaron una reducción del daño celular de aproximadamente el 12%, y dos estudios epidemiológicos adicionales reforzaron la correlación original.
Pero el hallazgo más significativo fue el mecanismo: el mate activa la autofagia, el proceso por el cual las células eliminan sus propios desechos. En el Parkinson, ese sistema de limpieza falla, y los detritos acumulados desencadenan el deterioro progresivo. El protagonista parece ser el ácido clorogénico, un antioxidante polifenólico que representa el 40% de la composición química del mate y que activa la enzima AMPK, reguladora del metabolismo energético celular. Los tomadores de mate consumen entre tres y cinco veces más ácido clorogénico que los bebedores de café. Además, el extracto completo resultó más potente que sus componentes aislados, lo que sugiere una acción sinérgica entre los compuestos de la planta.
Los experimentos también mostraron que el mate estimula el crecimiento de axones y dendritas en las neuronas dopaminérgicas, las estructuras que permiten la comunicación entre células. Ferrario, sin embargo, es cauteloso: los resultados son preliminares, no hay ensayos clínicos en humanos concluidos y los trabajos aún no han sido publicados en grandes revistas internacionales. El siguiente paso es trasladar lo que funciona en el laboratorio a la prueba definitiva: el cerebro humano vivo.
In laboratories at the University of Buenos Aires, researchers have spent the last decade chasing a simple question: could the drink that sits at the center of Argentine social life also protect the brain from one of its cruelest diseases?
Yerba mate is everywhere in Argentina—passed between friends at gatherings, sipped during study sessions, cradled through workdays. It is so woven into daily life that most people who drink it never think of it as medicine. But a team of scientists led by biologist Juan Ferrario has been building evidence that the plant might do something remarkable: slow the onset of Parkinson's disease by protecting the neurons most vulnerable to its damage.
The work began in earnest around 2015, when researcher Emilia Gatto analyzed more than 600 people and found something striking—those who drank mate regularly showed lower rates of Parkinson's than those who didn't. It was an inverse relationship, the kind that makes scientists sit up and ask why. Ferrario, who had spent 25 years studying neuroprotection in the laboratory, decided to test the hypothesis in his own models. "When that epidemiological work came out, I said, 'I want to see what happens in my model,'" he recalled.
In 2019, Ferrario's team published findings in Movement Disorders showing that yerba mate extract could extend the survival of dopaminergic neurons—the specific brain cells that Parkinson's destroys. The result was powerful enough to reshape the lab's entire research direction. "We saw that yerba mate extracts reduced the death of these neurons, favored their survival," Ferrario explained. The team has since replicated the effect in mouse models, documenting a protective effect that reduced cellular damage by roughly 12 percent. Two additional epidemiological studies have reinforced the original finding, each one adding weight to the hypothesis.
But protection alone wasn't enough. Ferrario's team wanted to understand the mechanism—the actual biological process by which yerba mate shields neurons from harm. What they discovered points to a fundamental cellular housekeeping function called autophagy: the cell's ability to eliminate waste and recycle its own components. In Parkinson's disease, this cleanup system fails. Dopaminergic neurons accumulate debris they cannot clear, and the buildup triggers progressive deterioration. Ferrario's research suggests that yerba mate activates this cleanup process, essentially helping neurons take out their own trash.
The key player appears to be chlorogenic acid, a polyphenol antioxidant that makes up roughly 40 percent of yerba mate's chemical composition. When Ferrario's team tested chlorogenic acid in isolation, it also protected neurons in their experimental models. The compound works by activating an enzyme called AMPK, which regulates cellular energy metabolism and, in turn, stimulates autophagy. Mate drinkers consume between three and five times more chlorogenic acid than coffee drinkers, despite the compound being present in both beverages. When the researchers compared yerba mate's protective effect against other known neuroprotectants like Trolox, the mate extract performed better. The complete extract proved more potent than its individual components tested separately, suggesting that multiple compounds in the plant work together.
The experiments also showed that yerba mate stimulates the growth of axons and dendrites in dopaminergic neurons—the branching structures that allow neurons to communicate. This is a sign that the plant may help preserve the brain's wiring even as disease threatens to unravel it. Yet Ferrario is careful about what these findings mean. The work remains preliminary. No conclusive clinical trials in humans have been completed. The results have not yet been published in major international scientific journals. What exists is a growing body of laboratory evidence and epidemiological data pointing in the same direction: that compounds in yerba mate, coffee, and green tea might offer protection against neurodegenerative disease through the simple act of keeping cells clean and energized. "The combination of epidemiological studies and our preliminary work, plus research happening around the world, allows us to begin explaining how these infusions could be preventing neurodegenerative diseases," Ferrario said. The next step is to move from the laboratory to the clinic, to see whether what protects neurons in a dish can protect them in a living human brain.
Citações Notáveis
We saw that yerba mate extracts reduced the death of these neurons, favored their survival— Juan Ferrario, biologist leading the UBA research team
The combination of epidemiological studies and our preliminary work, plus research happening around the world, allows us to begin explaining how these infusions could be preventing neurodegenerative diseases— Juan Ferrario
A Conversa do Hearth Outra perspectiva sobre a história
Why did it take until 2015 for someone to notice this connection? Yerba mate has been drunk for centuries.
The epidemiological work—studying large populations and their health outcomes—is relatively recent. You need good data, good record-keeping, and researchers asking the right question. Gatto's study of 600 people was the first to look at mate consumption and Parkinson's specifically.
So Ferrario saw that study and thought, "I should test this in my lab."
Exactly. He'd been studying neuroprotection for 25 years, looking at molecules and mechanisms. When he saw evidence from actual people showing an inverse relationship, he wanted to know if the effect was real at the cellular level.
And it was. But that's not the same as proving mate prevents Parkinson's in humans.
No. What they've shown is that the extract protects neurons in culture and in mouse models. That's the foundation. But you can't jump from a 12 percent reduction in cellular damage in mice to saying people should drink more mate to avoid Parkinson's. Not yet.
What's the chlorogenic acid doing, exactly?
It activates an enzyme called AMPK, which is like a master switch for cellular energy and cleanup. When AMPK is activated, the cell starts autophagy—it begins eating its own waste. In Parkinson's, neurons can't do this efficiently, so garbage accumulates and kills them.
So mate is just helping the cell do what it should already be doing.
Precisely. It's not introducing something foreign. It's amplifying a natural process that's failing in disease. That's why Ferrario thinks the effect is real—it's not magic, it's biology.
Why haven't these results been published yet?
They have been, in some cases—the 2019 work in Movement Disorders was published. But the more recent findings on chlorogenic acid and autophagy haven't appeared in major international journals yet. That takes time, peer review, replication.