People who eat lots of greens and other foods rich in magnesium have fewer strokes, says research. A fresh look at past research concludes that people who eat lots of greens and other foods rich in magnesium have fewer strokes -- a finding that supports current diet guidelines. But because the research focused on magnesium in food, the authors stopped short of recommending that people take a daily magnesium supplement. It s possible that another aspect of the food is responsible for the finding.