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Kale and other leafy greens could keep your brain young

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robert99 robert99 Sweden Posts: 1360
1 26 Dec 2017
http://www.smh.com.au/lifestyle/health-and-wellbeing/nutrition/eating-kale-and-other-leafy-greens-could-keep-your-brain-young-20171222-h09hf9.html

In research that gives new meaning to the expression "salad days," a study published in the journal Neurology last week found older people who ate at least one serving of leafy greens a day had a slower rate of decline on tests of memory and thinking skills than did people who rarely or never ate these vegetables.

After almost five years, regular consumers of such veggies as kale, spinach, collard greens and lettuce enjoyed a mental edge that was the equivalent of 11 years in age.

To be sure, the top tier of leafy-vegetable consumers started with cognitive scores that were slightly higher than those in the bottom tier. That's probably a testament to the power of lifelong eating patterns.

But over five years, the pattern of mental aging differed markedly in these two groups. Study participants who ate an average of roughly 1.3 servings of leafy greens a day experienced a decline in test performance that was about half as steep as that of participants whose daily consumption was near-zero.

Those stark differences were evident even after the researchers took account of a host of factors that are known to affect mental aging, including age, gender, education, exercise, participation in cognitive activities, smoking and consumption of seafood and alcohol.

Let's say you and your neighbour are both 75 and similar in most every way: You both completed the same amount of school, take regular walks together, don't smoke, and gather with friends over an occasional beer.

But while you enjoy a little more than a bowl of greens every day, your pal barely touches the stuff.

This long-running study would predict that at 75, your memory and thinking skills are a notch stronger than your neighbour's. Over the next five years, hers will decline twice as fast as yours.

By the time you're both 80, a battery of exercises that test several types of memory, as well as the speed and flexibility of your thinking, may show that your mental age is typical of a 75-year-old's. Meanwhile, your neighbour's performance on the same cognitive tests may look more like that of an 86-year-old.

"It's almost unbelievable," said Martha Morris, the senior author of the study who studies nutrition and brain health at Rush University Medical Center in Chicago. "Eating these leafy greens was independently associated with slower cognitive decline. That tells you this single food group contains so many nutrients it could be brain-protective."

Morris and her colleagues identified a small cluster of specific nutrients that appear to offer anti-aging benefits. The leafy greens that participants were asked about are generally rich in vitamin E, folic acid, vitamin K1, lutein and beta-carotene. While inconsistent, research has suggested that some or all of these nutrients may play some role in protecting the brain against inflammation, the accumulation of toxic proteins such as beta-amyloid, and neuronal damage and death.
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