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An unexpected trio — green tea, walnuts and a tiny aquatic plant called Mankai — might help keep the brain young, new research suggests.

In an 18-month randomized trial of nearly 300 adults, a plant-heavy "green Mediterranean" diet was linked to lower levels of Galectin-9, a blood protein associated with markers of faster brain aging on MRI, according to a study published in the journal Clinical Nutrition.

Researchers from Harvard University, Ben-Gurion University in Israel and the University of Leipzig in Germany looked at blood proteins and compared them with MRI scans that estimated participants' "brain age."

NEW VITAMIN COMPOUND SHOWS PROMISE FOR REVERSING ALZHEIMER'S DAMAGE TO THE BRAIN

Those who followed the gree

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