Carrots have long been seen as a sight-boosting superfood, but scientists in the United States have discovered that just two ounces, or 57 grams, of the nuts each day is the best way to keep the optician away.
Scientists at Tufts University in Massachusetts found that pistachios contain an antioxidant called lutein that can increase our “macular pigment optical density” (MPOD).
This helps filter the light from screens, protects the retina and also protects against degeneration.
Figures from the Macular Society show almost 1.5million people in the UK are affected by macular disease, making it the nation’s biggest cause of sight loss.
Dr Tammy Scott, a neuropsychologist who led the research, said: “Our study shows that pistachios aren’t just a tasty snack – they may be great for your eyes.
“Eating a small amount every day can help protect your vision, especially as you get older.”
In a trial, adults who were healthy except for a low lutein intake were asked to eat two ounces of pistachios a day, doubling their intake of the antioxidant. This group saw a significant increase in their MPOD in just six weeks.
Dr Scott said: “Pistachios are a nutrient-dense snack providing essential vitamins, minerals and antioxidants.” Lutein is available in other foods, such as broccoli and leafy greens, but the pistachio’s natural fats allow the antioxidant to be absorbed into the blood more easily. The research, part-funded by American Pistachio Growers and the National Institutes of Health, was published in The Journal of Nutrition.