As we age, so do our eyes. One of the most common age-related eye conditions is cataracts — the gradual clouding of the eye’s lens that can blur vision and, if untreated, lead to blindness. While surgery is currently the only way to fully treat cataracts, a growing body of research suggests that what we eat may influence how soon — or even whether — cataracts develop in the first place.

A recent systematic review, titled “Influence of Diet, Dietary Products and Vitamins on Age-Related Cataract Incidence,” dives deep into decades of global research to find out how our diets might protect our vision. Here’s a breakdown of the key findings and what they mean for your plate — and your eyes.

A Clear Link Between Diet and Cataract Risk

The review’s most important takeaway is this: There is a strong connection between diet and the risk of developing age-related cataracts (ARC). While genetics and aging still play a role, certain dietary choices, especially long-term eating habits, appear to delay or reduce the development of cataracts.

Plant-Based Diets Come Out on Top

Across the board, diets high in plant-based foods — including vegetables, fruits, legumes, nuts, and whole grains — were associated with a lower risk of cataracts. These foods are rich in antioxidants and anti-inflammatory compounds that help neutralize oxidative stress, which plays a major role in cataract development.

Additionally, fish, yogurt, and even coffee were linked to positive outcomes in many of the studies reviewed. These foods may offer a range of protective compounds, such as omega-3 fatty acids, probiotics, and polyphenols. Thus, a pescatarian diet may be the best approach for long-term eye health. 

Food First, Supplements Second

While multivitamin supplements can offer some benefit, the systematic review found that dietary intake of vitamins — through food — was more effective than taking isolated supplements. This was especially true for:

• Vitamin E (found in nuts, seeds, spinach)
• Vitamin B9 (folate) (found in leafy greens, legumes)
• β-carotene (found in carrots, sweet potatoes)

This suggests that synergy between nutrients in whole foods plays a bigger role in protection than high doses of any single supplement. Speak to a dietitian at INC Nutrition to find out if supplements are right for you. 

The Mediterranean Diet Debate

One of the more surprising discussions in the review centered around the Mediterranean diet. This eating pattern — known for its abundance of vegetables, fruits, olive oil, legumes, fish, and whole grains — is usually praised for reducing chronic disease risk.

Some studies in the review did not find a clear link between the Mediterranean diet and reduced cataract incidence. However, when looking closer, the total antioxidant capacity (TAC) of those adhering more closely to the Mediterranean diet was higher — a good sign for eye health. And other studies have shown a healthy dietary index, which includes many of the diet’s principles, is negatively associated with cataract risk.

So why the mixed results? One explanation is the study design. In one study, the control group was already on a fairly healthy low-fat diet, making it harder to see the added benefit of the Mediterranean diet.. Others point to changing definitions of the Mediterranean diet, as global food habits shift. Today’s version may include more processed, calorie-dense, or nutrient-poor foods than the traditional diet of past generations.

Interestingly, the study did correlate the Korean Diet (K-Diet) — which was described as a diet rich in cooked rice or barley, kimchi, seasoned vegetables, and medicinal herbs, and moderate in fish and pulses, and low in red meat — with significantly lower rates of cataracts when compared to Western diets and rice-based diets. 

Diet, Globalization, and Eye Health

An important insight from the review is the role of globalization and the homogenization of diets. As traditional diets give way to more Westernized, ultra-processed food patterns worldwide, the nutritional quality of the average diet may be declining — potentially increasing the risk of cataracts and other chronic diseases.

For example, even within populations known for traditional Mediterranean eating habits, recent studies show lower intakes of vitamins A, D, and folate due to modern food processing and lifestyle changes. This underlines the importance of personalizing diet recommendations to both cultural context and individual nutrient needs.

Research Gaps and the Road Ahead

Despite the strong findings, the review noted some important limitations:

• Most studies examined the effect of individual nutrients rather than overall dietary patterns.
• Some populations — especially from Africa and South America — were underrepresented in the data.
• There’s no clear consensus on specific vitamin doses to prevent cataracts.
• Early-stage cataract development may be hard to measure, making prevention studies tricky.

Still, the authors emphasized that filling these gaps could help create stronger guidelines for preventing vision loss in older adults.

Takeaway: Eat for Your Eyes — and Your Whole Body

While there’s no magic food that can guarantee perfect eyesight forever, this systematic review makes a compelling case: Long-term healthy eating can help reduce your risk of developing cataracts.

Here’s how to build an eye-protective plate:

• Fill half your plate with colorful fruits and vegetables
• Include leafy greens (spinach, kale) for lutein and folate
• Add fatty fish (salmon, sardines) for omega-3s
• Enjoy nuts and seeds for vitamin E
• Opt for whole grains over refined carbs
• Limit sugary, processed, and high-fat foods

Final Thoughts: Prevention Starts on Your Plate

As a growing body of evidence shows, good nutrition improves the health of your eyes. While cataract surgery remains highly effective, preventing or delaying the need for surgery can preserve quality of life and reduce healthcare costs — especially in aging populations.

If you’re looking to support your eye health through diet, speak with a Registered Dietitian. At INC Nutrition, we can help you personalize a nutrition plan based on your age, lifestyle, and unique health needs.

Your eyes will thank you for every bite.

Reference:

Falkowska, Martyna, et al. “Influence of diet, dietary products and vitamins on age-related cataract incidence: a systematic review.” Nutrients 15.21 (2023): 4585.