Leafy greens are packed with chlorophyll, which is a great source of nutrition.Mark Mawson/Getty ImagesA neurologist says there's a lot you can do for your brain health through small dietary changes.The first tip he recommends is eating more leafy greens, like spinach and kale.The nutrients that help plants grow up healthy and green are also good for our brains.Dean Sherzai, a neurologist and dementia researcher, has a favorite study.Published in 2018, and funded by the National Institute on Aging, the blockbuster study — which examined the eating patterns of over 900 older adults living around Chicago — showed that those who ate about one or two cupfuls of salad greens a day, including spinach, kale, collards, and lettuce, had brains that performed about 11 years younger than their lettuce-less peers of the same age."Just add green," Sherzai, half of the husband-and-wife team who call themselves "The Brain Docs," told me when I asked what single change I could make today to stave off neurodegenerative diseases.Doctors Dean and Ayesha Sherzai call themselves "The Brain Docs"Courtesy of The Brain Docs"If you have to start one place, because there's only so much space in your stomach, add two servings of greens to your diet," he told Business Insider.