Does Instant Coffee Harm Your Eyes? What Science Says About Macular Degeneration

For millions of people, starting the day without a cup of coffee is unthinkable—and the faster the prep, the better. But new research published in Nutrients is putting instant coffee under the microscope for a surprising reason: its possible link to age-related macular degeneration (AMD), a leading cause of vision loss in older adults.

Researchers analyzed health and dietary data from over 10,000 adults over age 40 using records from Korea’s National Health and Nutrition Examination Survey (KNHANES). They found that people who drank instant coffee more frequently had a significantly higher risk of developing AMD than those who preferred brewed coffee or other varieties.

AMD is a degenerative disease that damages the macula, a small area of the retina responsible for sharp, central vision. As it progresses, it can make everyday activities like reading, driving, or recognizing faces more difficult. While genetics and age are well-known risk factors, this study suggests that dietary habits may also play a role.

So why instant coffee? The researchers point out that instant varieties often contain additives, hydrogenated fats, and sugars—especially in popular “3-in-1” mixes found throughout Asia and Latin America. These extras could contribute to chronic inflammation and oxidative stress, two factors known to damage retinal cells over time.

This doesn’t mean that the occasional cup of instant coffee is dangerous. The concern lies with high daily intake that crowds out purer options like freshly brewed coffee from whole beans. How you prepare your coffee—and what you add to it—matters too. Creamers, flavored powders, and ultra-processed sweeteners can all add hidden ingredients that may undermine long-term eye health.

Of course, the study is observational and doesn’t prove direct cause and effect. But it does open the door to more research on how everyday foods and drinks can speed up—or slow down—age-related degeneration. For eye health, experts consistently recommend a diet rich in natural antioxidants: fruits, leafy greens, fatty fish, and nuts can all help protect the retina and maintain vision as you age.

For coffee lovers, the takeaway is simple: focus on quality and moderation. Choose whole-bean coffee when you can, go easy on additives, and be mindful of what your daily brew might be doing for your eyes—not just your energy levels.

Source: Food & Nutrition