Several nutrients directly support the tear film that keeps your eyes moist, and you can get most of them from common foods. The most studied are omega-3 fatty acids, vitamin A, and certain antioxidants, but overall dietary patterns and even basic hydration play a bigger role than many people expect.
Fatty Fish and Other Omega-3 Sources
Omega-3 fatty acids are the most widely researched nutrient for dry eyes. They work in two ways: reducing inflammation on the eye’s surface and improving the oily outer layer of the tear film. That oily layer, produced by tiny glands along your eyelids called meibomian glands, is what prevents your tears from evaporating too quickly. Omega-3s influence the composition of the oils these glands produce, making the layer more stable and effective.
The best food sources are fatty fish like salmon, mackerel, sardines, anchovies, and herring. These provide EPA and DHA, the two forms of omega-3 your body uses most readily. Walnuts, flaxseeds, chia seeds, and hemp seeds contain a plant-based omega-3 (ALA) that your body partially converts to EPA and DHA, though less efficiently. Aiming for two to three servings of fatty fish per week is a reasonable target.
One important nuance: the largest clinical trial on omega-3 supplements and dry eye, called the DREAM study, found no significant benefit over placebo at 12 months, and an extension study confirmed that result. This doesn’t necessarily mean omega-3s from food are useless. The study used supplements at specific doses (2,000 mg EPA and 1,000 mg DHA daily), and the placebo was olive oil, which itself contains beneficial fats. What it does suggest is that popping a fish oil capsule alone may not be the fix many people hope for. Getting omega-3s as part of a broader healthy diet, rather than relying on a single supplement, is a more realistic approach.
Vitamin A: the Tear Film’s Foundation
Vitamin A is essential for the cells that produce the inner mucus layer of your tears. This layer is made by goblet cells in the tissue lining your eyelids. Without enough vitamin A, these goblet cells gradually disappear. Animal studies show that prolonged deficiency causes a complete loss of the mucus-producing cells, and in humans, severe deficiency leads to a condition called xerophthalmia, where the eye surface dries out and becomes damaged.
You don’t need to be severely deficient to notice effects. Even modest shortfalls can reduce mucus production and leave the tear film less stable. The richest food sources of preformed vitamin A are liver, egg yolks, and dairy products like whole milk and cheese. Your body also converts beta-carotene into vitamin A, so orange and dark green vegetables count too: sweet potatoes, carrots, spinach, kale, and cantaloupe are all excellent sources. A single medium sweet potato provides more than a full day’s worth of vitamin A.
Lutein and Zeaxanthin for Eye Surface Protection
These two antioxidants, found in high concentrations in the eye, help protect the ocular surface from oxidative stress and inflammation. They work partly by neutralizing reactive oxygen species (unstable molecules that damage cells) and partly by blocking some of the blue light that reaches the eye, reducing light-related cellular damage. Lutein has also been shown to inhibit inflammatory signaling pathways that can worsen dry eye symptoms.
Eggs are one of the most bioavailable sources because the fat in the yolk helps your body absorb these fat-soluble nutrients. Leafy greens like kale, spinach, and collard greens contain the highest absolute amounts. Corn, orange peppers, and pistachios are also good sources. Since lutein and zeaxanthin are fat-soluble, eating these foods with a little olive oil or another healthy fat improves absorption significantly.
Evening Primrose Oil and Omega-6 Balance
Not all omega-6 fats are inflammatory. Gamma-linolenic acid (GLA), a specific omega-6 found in evening primrose oil, borage oil, and black currant seed oil, has shown consistent benefits for dry eye in several clinical trials. In one study, patients with inflammatory dry eye who took GLA and linoleic acid for 45 days experienced improvements in symptoms, surface inflammation, and corneal staining. Contact lens wearers who supplemented with evening primrose oil for six months reported less dryness and discomfort, along with measurable increases in tear volume.
GLA works by converting into an anti-inflammatory compound (PGE1) in the body. In patients with Sjögren’s syndrome, a condition that causes severe dryness, supplementation with GLA raised levels of this compound in their tears. GLA is hard to get from everyday foods alone, so this is one case where a supplement (evening primrose or borage oil) may be worth considering alongside dietary changes.
Vitamins C and E: Protecting the Eye Surface
Vitamins C and E are antioxidants that help protect the corneal surface from free radical damage. In a study of diabetic patients, who tend to have elevated oxidative stress, oral supplementation with vitamins C and E improved tear film stability, tear secretion, and the overall health of the eye surface. The improvements in tear stability correlated directly with higher goblet cell counts, meaning these vitamins helped preserve the same mucus-producing cells that vitamin A supports.
Vitamin C is abundant in citrus fruits, bell peppers, strawberries, broccoli, and kiwi. Vitamin E is found in almonds, sunflower seeds, hazelnuts, avocados, and olive oil. These two vitamins work synergistically: vitamin C regenerates vitamin E after it neutralizes a free radical, so eating sources of both together gives you more protection than either alone.
The Mediterranean Diet Connection
Rather than focusing on individual nutrients, the overall pattern of your diet may matter most. A study from the PREDIMED-PLUS trial found that patients with metabolic syndrome who followed a Mediterranean diet for six months showed an overall improvement in both dry eye signs and symptoms. The Mediterranean diet is rich in exactly the nutrients discussed above: fatty fish, olive oil, nuts, leafy greens, and colorful vegetables. It’s also naturally low in processed foods and refined sugars, which tend to promote the kind of systemic inflammation that worsens dry eye.
This makes practical sense. Dry eye is rarely caused by a single nutrient deficiency. It’s an inflammatory condition influenced by your overall metabolic health, so a dietary pattern that reduces bodywide inflammation is more likely to help than any one food in isolation.
Why Hydration Matters More Than You’d Think
Your tears are mostly water, and your body’s overall hydration level directly affects their concentration. When you’re even mildly dehydrated (a loss of 2 to 3% of body mass), tear osmolarity rises, meaning your tears become saltier and more irritating. In controlled experiments, rehydration over 48 hours brought tear osmolarity back to normal levels.
This is especially relevant for older adults, who are more prone to both dehydration and dry eye. Researchers have suggested that in some elderly patients, what appears to be dry eye disease is actually secondary to chronic mild dehydration. Data indicates that fewer than 2% of people drinking 3 liters or more of fluid per day have elevated plasma concentration levels associated with dehydration. You don’t necessarily need to hit that exact number, but consistently drinking water throughout the day, and not waiting until you feel thirsty, is one of the simplest things you can do for dry eyes.
Putting It Together
If you’re building a grocery list with your eyes in mind, here’s what earns a spot: salmon or sardines a few times a week, eggs, leafy greens like spinach and kale, sweet potatoes or carrots, a handful of walnuts or almonds, bell peppers or citrus fruit, and olive oil as your go-to cooking fat. Drink water consistently throughout the day. This isn’t a special “eye diet.” It’s essentially a Mediterranean eating pattern, which is the only dietary approach that’s been tested as a whole and shown to improve dry eye measures over six months.
No single food will eliminate dry eyes, especially if other factors like screen time, medications, or environmental conditions are involved. But the tear film is a biological structure that your body rebuilds continuously, and the raw materials you give it through food make a measurable difference in how well it functions.