The association appeared only with instant coffee, not regular brewed
Um estudo genético conduzido na China lança uma sombra específica sobre o café solúvel, associando o seu consumo à degeneração macular relacionada com a idade — uma das principais causas de perda de visão em adultos mais velhos. A descoberta não prova causalidade, mas distingue-se pela sua precisão: o risco identificado não se aplica ao café filtrado nem ao descafeinado, sugerindo que o método de processamento, e não o café em si, pode ser o fator determinante. Num momento em que o café instantâneo conquista gerações mais jovens pela sua comodidade, a ciência convida à reflexão sobre o preço silencioso da conveniência.
- Investigadores da Universidade Médica de Hubei identificaram uma ligação genética entre o café solúvel e a degeneração macular, uma doença que compromete a visão central e pode tornar tarefas quotidianas — ler, reconhecer rostos — profundamente difíceis.
- A associação é específica e perturbadora: não foi encontrada no café filtrado nem no descafeinado, o que aponta para o processo de fabrico do café instantâneo como possível responsável.
- O consumo de café solúvel está em alta precisamente entre os mais jovens — millennials e geração Z —, tornando este estudo relevante para uma faixa etária que raramente associa os seus hábitos a doenças tipicamente ligadas ao envelhecimento.
- Os investigadores sublinham que a associação não equivale a causalidade, mas recomendam que pessoas com predisposição genética para a doença limitem o consumo de café instantâneo.
- O optometrista James Dello Russo já aconselha os seus pacientes em risco a substituir o café solúvel pelo filtrado — uma mudança simples que pode representar uma precaução significativa enquanto a ciência aprofunda as suas respostas.
Investigadores chineses identificaram uma associação genética entre o consumo de café solúvel e a degeneração macular relacionada com a idade (AMD), uma doença progressiva da retina que figura entre as principais causas de perda de visão no mundo. O estudo, publicado na revista Food Science & Nutrition e conduzido pela Universidade Médica de Hubei e pelo Hospital Taihe, analisou dados genéticos para estabelecer esta ligação — com uma especificidade que chama a atenção: a associação surgiu apenas com o café instantâneo, não com o café filtrado nem com o descafeinado.
Esta distinção sugere que o método de processamento, e não o café enquanto planta, poderá ser o fator relevante. Os autores são cautelosos: não afirmam que o café solúvel causa AMD, mas recomendam que indivíduos com predisposição genética para a doença considerem reduzir o seu consumo. A recomendação é direcionada, não universal — um reflexo da seriedade e dos limites do que foi encontrado.
A AMD danifica a mácula, a região central da retina responsável pela visão direta, aquela que nos permite ler, escrever e reconhecer rostos. Embora não cause cegueira total, a perda de visão central pode alterar profundamente a qualidade de vida. O optometrista James Dello Russo, que comentou o estudo para a Fox News, reconheceu a ausência de prova de causalidade, mas considerou a magnitude do risco suficiente para agir: passou a aconselhar os seus pacientes preocupados com a AMD a trocar o café solúvel pelo filtrado.
O estudo chega num momento em que o café instantâneo cresce em popularidade, especialmente entre millennials e geração Z, atraídos pela sua comodidade. Para os investigadores, a questão que fica em aberto é o que, exatamente, no processo de fabrico do café solúvel poderá explicar esta associação — e se padrões semelhantes poderão emergir noutros alimentos processados de forma comparável.
Researchers in China have identified a genetic link between instant coffee and age-related macular degeneration, a progressive eye disease that ranks among the leading causes of vision loss worldwide. The study, published this year in Food Science & Nutrition, examined the relationship between powdered coffee consumption and AMD—a condition that damages the macula, the part of the retina responsible for central vision. What makes the finding notable is its specificity: the association appeared only with instant coffee, not with regular brewed coffee or decaffeinated varieties, suggesting that the processing method itself may play a role.
The research was conducted by scientists at Hubei Medical University and Taihe Hospital in China, who analyzed genetic data to uncover this connection. Their work arrives at a moment when instant coffee consumption is surging, particularly among younger demographics. Millennials and Generation Z have embraced the convenience of powdered coffee in ways previous generations did not, making the timing of this research especially relevant to public health conversations.
It bears emphasizing that the researchers have not established that instant coffee directly causes macular degeneration. The distinction matters. What they found is an association—a statistical relationship that warrants attention but does not prove causation. Still, the team concluded that people at elevated genetic risk for AMD should consider limiting their intake of instant coffee. The specificity of their recommendation reflects the measured nature of their findings: this is not a blanket warning to all coffee drinkers, but guidance for those whose biology predisposes them to the disease.
Age-related macular degeneration is a disease of the retina that typically emerges as people grow older, though it can appear in younger individuals as well. The condition causes damage to the macula, the central region of the eye that enables us to see objects directly in front of us—to recognize faces, to read, to write. While AMD does not lead to complete blindness, the vision loss it produces can profoundly disrupt everyday life. A person with advanced macular degeneration may struggle with tasks most of us take for granted.
Optometrist James Dello Russo, commenting on the study to Fox News, acknowledged that the research does not prove causation, yet he argued that the magnitude of the risk identified justifies serious attention. He has begun advising his own patients who are concerned about AMD to switch from instant coffee to filtered varieties—coffee that passes through a filter rather than dissolving directly into water. This represents a practical middle ground: not eliminating coffee entirely, but choosing a preparation method that appears to carry no identified genetic risk.
The findings underscore a broader principle in health research: processing and preparation matter. The same plant, prepared differently, can have different effects on the body. For instant coffee drinkers worried about their eye health, the path forward is straightforward—though perhaps less convenient than reaching for a jar of powder. For researchers, the work raises questions about what in the instant coffee formulation might account for the association, and whether similar patterns might emerge in other foods or beverages processed in comparable ways.
Citas Notables
People with high genetic risk for age-related macular degeneration should avoid consuming instant coffee— Researchers at Hubei Medical University and Taihe Hospital
The magnitude of the risk justifies attention, even though causation remains unproven— Optometrist James Dello Russo
La Conversación del Hearth Otra perspectiva de la historia
So the study found that instant coffee causes macular degeneration?
Not quite. They found a genetic association—a statistical link—but they're careful not to claim causation. It's an important distinction. The connection exists in the data, but we don't yet know if instant coffee is the cause or if something else is happening.
Why only instant coffee, then? Why not regular coffee?
That's the puzzle that makes this worth paying attention to. The processing method appears to matter. When you dissolve coffee into powder, something changes about how it interacts with our biology—at least genetically. Regular brewed coffee showed no such association.
Should people stop drinking instant coffee?
Not everyone. The researchers are specifically advising people at high genetic risk for AMD to limit it. If you have no family history and no genetic predisposition, this study doesn't necessarily apply to you. But if you're already at risk, switching to filtered coffee is a simple precaution.
How serious is macular degeneration?
It's serious enough that it's one of the leading causes of vision loss in older adults. You don't go blind completely, but you lose the ability to see what's directly in front of you. Reading, recognizing faces—these become difficult or impossible.
Why is this study coming out now?
The timing is significant because instant coffee consumption is booming, especially among younger people. Millennials and Gen Z have embraced the convenience. So researchers are flagging a potential risk just as the habit is becoming more widespread.
What should someone do if they love instant coffee?
An optometrist quoted in the reporting suggests switching to filtered coffee—same caffeine, same ritual, but prepared differently. It's a practical compromise rather than complete abstinence.