Research shows that people with intermediate age-related macular degeneration consume more than twice as much lutein and zeaxanthin (11 mg daily versus 5.3 mg) compared to those with healthy eyes, according to a 2026 cross-sectional study of 369 older adults. Gram Research analysis found that blood levels of these eye-protective nutrients were strongly linked to how much accumulated in the retina, suggesting that dietary intake or supplements can increase these protective compounds in your eyes. However, the study doesn’t prove that increasing intake prevents vision loss—only that people with more advanced eye disease tend to consume more of these nutrients.
According to Gram Research analysis, a new study of 369 older adults found that people who consumed more lutein and zeaxanthin—nutrients found in leafy greens and supplements—had higher levels of these protective compounds in their blood and eyes. Researchers discovered that people with intermediate age-related macular degeneration (a common cause of vision loss in older adults) consumed significantly more of these nutrients and had more of them stored in their retinas compared to those with early or no eye disease. The study suggests that getting enough of these eye-protective nutrients through diet or supplements may help preserve vision as we age, though more research is needed to prove they can prevent or slow the disease.
Key Statistics
A 2026 cross-sectional study of 369 adults aged 63 and older found that people with intermediate macular degeneration consumed 11 mg daily of lutein and zeaxanthin compared to 5.3 mg in those with healthy eyes, with 56% using supplements versus only 10% in the healthy group.
According to research reviewed by Gram, blood levels of lutein and zeaxanthin showed a strong correlation (r = 0.41-0.67) with how much of these nutrients accumulated in the retina, suggesting efficient transport from diet to eye storage.
In the 2026 ALSTAR2 study, dietary intake alone averaged only 3.5-3.8 mg daily across all three eye health groups, indicating that supplements—not food—accounted for the higher total intake in people with advanced macular degeneration.
The study found that 56% of people with intermediate macular degeneration used lutein and zeaxanthin supplements compared to 17% with early disease and 10% with healthy eyes, suggesting either preventive use or post-diagnosis supplementation.
The Quick Take
- What they studied: Whether eating foods rich in lutein and zeaxanthin (or taking supplements containing these nutrients) affects how much of these protective compounds end up in your blood and eyes, and whether this connection differs in people with age-related macular degeneration.
- Who participated: 369 adults aged 63 and older (average age 74) from an eye clinic. About 60% were women, 89% were White, and 62% had never smoked. Researchers looked at one eye per person and categorized them into three groups: 48% with healthy eyes, 26% with early macular degeneration, and 25% with intermediate macular degeneration.
- Key finding: People with intermediate macular degeneration consumed more than twice as much lutein and zeaxanthin (11 mg per day) compared to those with healthy eyes (5.3 mg per day), and they had significantly more of these nutrients stored in their retinas. Blood levels of these nutrients were strongly linked to how much accumulated in the eye.
- What it means for you: Eating more leafy greens or taking supplements with lutein and zeaxanthin may help protect your vision as you age. However, this study shows only that people with better eye health tend to consume more of these nutrients—it doesn’t prove that increasing your intake will prevent vision loss. Talk to your doctor before starting supplements.
The Research Details
Researchers recruited 369 older adults from an eye clinic and collected information about them all at one point in time (called a cross-sectional study). Each person answered questions about what they ate and whether they took supplements containing lutein and zeaxanthin. Doctors measured how healthy their eyes were using a standard 9-step scale, took a blood sample to measure nutrient levels, and used a special camera to photograph the back of their eye and measure how much of these protective nutrients had accumulated there.
The researchers then looked for patterns: Did people who ate more of these nutrients have higher blood levels? Did people with higher blood levels have more of the nutrients in their eyes? Did people with different stages of macular degeneration differ in their nutrient intake or levels? They adjusted their analysis to account for age and cholesterol levels, which can affect how nutrients are absorbed.
This approach is important because it shows real-world relationships between what people eat, what ends up in their blood, and what accumulates in their eyes. By measuring all three things in the same people, researchers can understand the chain of events: nutrients from food → blood levels → eye storage. This helps scientists design better studies to test whether increasing these nutrients can actually prevent or slow eye disease.
This study has several strengths: a reasonably large sample size (369 people), use of standardized eye disease classifications, and measurement of nutrients through multiple methods (diet questionnaires, blood tests, and retinal imaging). However, because it’s cross-sectional, it shows associations but not cause-and-effect. The sample was 89% White and recruited from one clinic, so results may not apply equally to all populations. The study didn’t measure all factors that might affect nutrient absorption, such as digestive health or medication use.
What the Results Show
The study revealed a clear pattern: people with intermediate macular degeneration stood out from the other two groups. They consumed an average of 11 mg of lutein and zeaxanthin daily, compared to 5.3 mg in healthy eyes and 5.5 mg in early disease—more than double the amount in healthy individuals. Notably, this higher intake came almost entirely from supplements: 56% of people with intermediate disease used supplements containing these nutrients, compared to only 10% of those with healthy eyes.
When researchers measured blood levels of these nutrients, they found a strong connection to how much accumulated in the retina (the light-sensitive tissue at the back of the eye). The correlation was particularly strong, with blood levels explaining a significant portion of the variation in retinal storage. This suggests that if you can get these nutrients into your bloodstream, your eyes will capture and store them.
Interestingly, dietary intake alone (from foods like spinach and kale) didn’t differ much between the three groups—everyone averaged around 3.5-3.8 mg daily from food. The real difference was in supplement use. This suggests that people with more advanced eye disease may have started taking supplements after their diagnosis, or that supplements provide a more concentrated source of these nutrients than food alone.
The study found that the connection between total nutrient intake and blood levels was moderate but consistent across all three groups. This means that eating more of these foods or taking supplements does increase blood levels, though the relationship isn’t perfectly predictable—some people’s bodies absorb and use these nutrients more efficiently than others. Cholesterol levels (both HDL and LDL) didn’t differ between groups and didn’t significantly affect the nutrient relationships, suggesting that cholesterol management isn’t a major factor in how these eye nutrients work.
This research builds on earlier findings from the same research group showing that people with intermediate macular degeneration have higher retinal and blood levels of these nutrients. The new contribution is measuring dietary intake alongside blood and eye levels in the same people, showing the complete pathway from food to eye storage. This aligns with decades of research suggesting that lutein and zeaxanthin act as protective antioxidants in the eye, though this study doesn’t prove they prevent disease—only that they accumulate more in certain eyes.
The biggest limitation is that this study captures one moment in time, so researchers can’t determine whether high nutrient levels protect against disease or whether people with eye disease simply started consuming more nutrients after diagnosis. The study can’t prove cause-and-effect. Additionally, the sample was mostly White and recruited from one clinic, so results may differ in other populations. The researchers didn’t measure other factors that affect nutrient absorption, such as digestive disorders, medications, or genetic differences. Finally, the study relied on people’s memory of what they ate, which can be inaccurate.
The Bottom Line
If you’re over 60, consider increasing your intake of lutein and zeaxanthin through food sources like spinach, kale, broccoli, and other dark leafy greens (moderate confidence). If you have early or intermediate macular degeneration, discuss supplements with your eye doctor (moderate confidence). The evidence suggests these nutrients are important for eye health, but this study doesn’t prove that increasing intake will prevent disease. Current evidence supports the AREDS2 supplement formula, which includes these nutrients, for people with intermediate or advanced macular degeneration.
This research is most relevant to adults over 60, particularly those with a family history of macular degeneration or those already diagnosed with early or intermediate disease. People with healthy eyes may benefit from eating nutrient-rich foods but don’t necessarily need supplements. Anyone considering supplements should discuss it with their doctor, especially if they take blood thinners or have other health conditions.
If you increase your dietary intake of these nutrients, blood levels may rise within weeks to months. However, accumulation in the retina takes longer—likely months to years. Any protective effect on vision would take even longer to measure. This is a long-term strategy, not a quick fix.
Frequently Asked Questions
What foods have lutein and zeaxanthin for eye health?
Dark leafy greens are the best sources: spinach, kale, collards, and broccoli contain the most. One cup of cooked spinach provides about 20 mg. Other sources include peas, corn, and Brussels sprouts. A 2026 study found that most people get only 3.5 mg daily from food alone.
Can lutein and zeaxanthin supplements prevent macular degeneration?
This study shows people with advanced macular degeneration consume more of these nutrients, but it doesn’t prove supplements prevent the disease. The AREDS2 research supports supplements for people already diagnosed with intermediate or advanced disease. Talk to your eye doctor before starting supplements.
How much lutein and zeaxanthin should I take daily?
The AREDS2 formula recommends 10 mg of lutein and 2 mg of zeaxanthin daily for people with macular degeneration. For healthy eyes, eating foods rich in these nutrients is recommended. This 2026 study found healthy people averaged 5.3 mg daily total intake.
Does eating more spinach improve your eyesight?
Eating more dark leafy greens increases blood and eye levels of protective nutrients, but this study doesn’t prove it improves vision. These nutrients may slow age-related vision loss, particularly in people already showing signs of macular degeneration. Benefits take months to years to develop.
Who should take lutein and zeaxanthin supplements?
People over 60 with early or intermediate macular degeneration should discuss supplements with their eye doctor. Those with healthy eyes may benefit from eating nutrient-rich foods. People with family history of macular degeneration may consider preventive measures, but consult your doctor first.
Want to Apply This Research?
- Track daily intake of lutein and zeaxanthin in milligrams by logging servings of dark leafy greens (spinach, kale, collards), broccoli, and other green vegetables. One cup of raw spinach contains about 6.3 mg; one cup of cooked spinach contains about 20 mg.
- Set a daily goal to include at least one serving of dark leafy greens at lunch or dinner. Use the app to log which vegetables you ate and estimate your daily intake. If you take supplements, log the dose and type.
- Track weekly average intake over months and years. If you have macular degeneration, work with your eye doctor to schedule regular retinal imaging to monitor changes. Use the app to correlate your nutrient intake with any changes in vision or eye health measurements from your doctor.
This research describes associations between nutrient intake and eye health but does not prove cause-and-effect relationships. This information is not a substitute for professional medical advice. If you have macular degeneration or concerns about your vision, consult an ophthalmologist or optometrist before making dietary changes or starting supplements. People taking blood thinners or with certain health conditions should discuss supplements with their doctor before use. The AREDS2 supplement formula is specifically studied for intermediate and advanced macular degeneration; results may not apply to other eye conditions or healthy individuals.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.