TL;DR
Recent research from China has revealed a concerning link between instant coffee consumption and age-related macular degeneration (AMD), particularly the dry form of the condition.
If you’re someone living with AMD or at risk of developing it, this new evidence could be an important piece of the puzzle in protecting your vision.
The study that’s got everyone talking
Published in June 2025 in the journal Food Science & Nutrition, researchers from Hubei University of Medicine used advanced genetic analysis techniques to investigate the relationship between different types of coffee and AMD. What they found was striking.
The study revealed that each standard deviation increase in instant coffee consumption was associated with a 6.92-fold increased risk of developing dry AMD.
To put that into perspective, that’s nearly a seven times higher risk.
Importantly, this link was specific to instant coffee – the researchers found no such association with freshly ground coffee, decaffeinated coffee, or other types of coffee.
Why instant coffee, specifically?
You might be wondering why instant coffee would pose a risk when other forms of coffee don’t. The answer lies in how instant coffee is made.
Instant coffee undergoes an intense manufacturing process involving high heat and concentration. The coffee is first brewed into a concentrated extract, then either spray-dried or freeze-dried. This process creates several potentially harmful compounds:
- Acrylamide: A chemical that forms when coffee is processed at high temperatures. Acrylamide has been linked to oxidative stress and cellular damage.
- Advanced glycation end products (AGEs): These are compounds that form during the heating process. AGEs can trigger inflammatory responses in the body and have been specifically implicated in retinal damage. They work by binding to receptors called RAGE, which then activate pathways that lead to inflammation, oxidative stress, and potential damage to the blood-retinal barrier.
- Oxidised lipids and additives: Instant coffee often contains added ingredients like sugar or creamer, and the production process can lead to the oxidation of fats, creating compounds that may contribute to cellular stress.
Freshly brewed coffee, by contrast, doesn’t undergo this intense processing. The gentler brewing method preserves beneficial compounds whilst avoiding the formation of these potentially harmful substances.
The antioxidant paradox
Here’s where it gets interesting. Coffee – particularly freshly brewed coffee – is actually rich in antioxidants that can be beneficial for eye health. Chlorogenic acid, one of coffee’s main antioxidants, has been shown in animal studies to protect against retinal degeneration.
Coffee’s antioxidants can help combat oxidative stress, which is a key factor in many eye conditions, including AMD. These compounds have anti-inflammatory properties and may even help reduce the risk of other age-related conditions.
Research has shown that chlorogenic acid can protect retinal cells from damage in laboratory studies. So whilst instant coffee appears to pose risks, fresh coffee might actually offer some protective benefits.
It’s a reminder that not all coffee is created equal, and the way it’s processed matters enormously.
What does this mean for you?
If you’re at risk of AMD or already living with the condition, here’s what you need to know:
Consider switching from instant to fresh
If you’re a regular instant coffee drinker, now might be the time to invest in a cafetière, filter machine, or even just a simple pour-over setup. Freshly ground coffee not only tastes better but appears to be a safer choice for your eyes.
Don’t panic about occasional instant coffee
The study looked at habitual consumption patterns. Having the occasional instant coffee when you’re travelling or in a pinch isn’t likely to cause significant harm. It’s the daily, long-term consumption that appears to be the concern.
Remember that genetics play a role
This research used Mendelian randomisation, a technique that looks at genetic variations to understand causal relationships. If you have a family history of AMD, you may want to be particularly mindful of your instant coffee intake.
Focus on your overall diet
No single dietary change will prevent or cure AMD, but a comprehensive approach to eye health – including AREDS2 supplements, a diet rich in leafy greens and omega-3 fatty acids, and protecting your eyes from UV light – can all contribute to better outcomes.
Related read: Best Foods For Eye Health
Take these studies with a pinch of salt
It’s worth noting that previous research on coffee and eye health has been somewhat mixed. Some studies have suggested that moderate coffee consumption might reduce the risk of certain eye conditions, whilst others have raised concerns.
What’s becoming clear is that the type of coffee matters significantly. The 2025 study adds to growing evidence that instant coffee may have unique risks that don’t apply to other forms of coffee. This is consistent with other research showing that instant coffee is negatively associated with telomere length (a marker of cellular ageing) and may have different effects on various health outcomes compared to fresh coffee.
On the positive side, research has shown that coffee – when consumed in its less processed forms – can:
- Help stimulate tear production
- Provide antioxidant protection to retinal cells
- Potentially reduce inflammation associated with eye disease
- Support overall cardiovascular health, which is closely linked to eye health.
A balanced approach
At Pure Optical, we believe in giving you the full picture so you can make informed decisions about your eye health. The evidence linking instant coffee to dry AMD is compelling and based on rigorous genetic analysis. For anyone concerned about macular degeneration, switching to freshly brewed coffee seems like a sensible precaution.
However, it’s also important to keep this in perspective. AMD is a complex condition influenced by multiple factors including age, genetics, smoking status, diet, and UV exposure. No single dietary change is a magic bullet, but making considered choices – like opting for fresh over instant coffee – can be part of a broader strategy to protect your vision.
Taking action today
If you’re living with AMD or at higher risk due to family history, here are some practical steps you can take:
- Switch to fresh coffee: It doesn’t have to be expensive or complicated. A simple cafetière or filter cone can make excellent coffee at home.
- Continue with your AREDS2 supplements: Evidence-based supplements like our Eyesight Plus formula remain one of the most effective ways to slow AMD progression.
- Stay on top of your eye health: Regular check-ups with your optician are essential for catching any changes early.
- Consider other lifestyle factors: Stop smoking if you haven’t already, protect your eyes from UV light with quality sunglasses, and maintain a diet rich in leafy greens and omega-3 fatty acids.
- Don’t stress excessively: Whilst this research is important, remember that stress itself isn’t good for your health. Make the switch to fresh coffee, but don’t worry about the occasional instant when circumstances require it.
Keep your eyes in check as you age
The connection between instant coffee and dry AMD adds another piece to our understanding of how diet influences eye health. Whilst the findings are significant, they’re also actionable. By choosing freshly brewed coffee over instant, you’re taking a simple step that could help protect your vision for years to come.
Looking after your eyes shouldn’t be complicated. Sometimes, it’s as straightforward as changing the type of coffee in your cupboard. And, if you pair that with quality eye supplements and regular check-ups, you’re giving your eyes the best possible chance to stay healthy as you age.
