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Carrots have coasted on their eye-health reputation for more than 80 years. During World War II, propaganda posters claimed that carrots were the reason fighter pilots could spot enemy bombers in the dark, a handy cover story for the secret radar equipping their planes.
The vitamin A in carrots does actually matter for your eyes, which helped the legend stick. But the sharpest part of our vision relies on a different pair of nutrients, and one of them turns up in a very popular snack.
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Let’s get into it,
Tim Snaith
Newsletter Editor, Healthline
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Written by Tim Snaith
October 29, 2026 • 2 min read
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The pigments that protect your sharpest vision
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Pistachios make you work for every crunchy morsel. A 2025 study examining their eye-health benefits suggests that the pile of shells and husks is worth it. 36 healthy adults with an average age of about 60 ate 2 ounces of pistachios a day for 12 weeks. By week 6, the protective pigment at the back of their eyes had grown denser. A comparison group that ate as usual saw no change.
That pigment sits in the macula, the small spot in the center of your retina that handles sharp, detailed vision, such as reading. It’s made of two plant compounds, lutein and zeaxanthin. Your body can’t make either of them, so it all has to come from foods like dark green vegetables. These pigments are thought to absorb blue light and limit damage to the cells you see with. Pistachios are the only tree nut with a meaningful amount of lutein.
Denser pigment in the macula is associated with a lower risk of age-related macular degeneration (AMD), the leading cause of vision loss in older adults. Whether pistachios lower that risk hasn’t been tested yet. The strongest evidence so far comes from National Eye Institute trials. A daily supplement with lutein, zeaxanthin, vitamins C and E, zinc, and copper lowered the odds of AMD getting worse by about 25% in people who already had intermediate AMD. It didn’t help people without the condition.
Most people get 1-2 milligrams (mg) or less of lutein and zeaxanthin a day. About 3 cups of raw spinach provide around 12 mg, and egg yolks, peas, corn, and orange bell peppers add more. These compounds dissolve in fat, so you’ll absorb more when your greens come with a little olive oil or an egg.
Your eyes use other nutrients too. Vitamin A helps you see in dim light, and zinc (good sources include oysters, meat, and pumpkin seeds) supports that job. Vitamin C is much more concentrated in the eye than in the blood. The omega-3 fat DHA is a building block of the retina, and oily fish like salmon is the easiest way to get it.
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Want to learn more about food, diets, cooking, or some other nutrition subject? Let us know at nutritionedition@healthline.com, and we’ll look into it for you! (Heads-up: We may use your response in an upcoming newsletter.)
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RECIPE PICKPistachio-Cherry CrumbleAs well as the pigments in the pistachios, cherries contain polyphenols with antioxidant properties that may help regulate your blood sugar and protect against diseases.GET THE RECIPE →
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| A Full Spine Reset in Just 4 Moves |
| Everything feels harder when your spine is not moving well. These four moves are designed to stretch your lower back and hips, mobilize your middle back, challenge your core stability and balance, and decompress your entire spine from your lower back all the way down to your toes. |
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Until next time,
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Take care of yourself, and we’ll see
you again soon!
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French toast.
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