How can you lower your heart attack risk without losing weight?

A new and very rigorous study shows that a Mediterranean diet full of fresh fruits and vegetables, nuts, fish and olive oil can lower the risk of stroke and other serious heart trouble by 30 percent. The improvement was not linked to weight. The researchers followed some 7,500 people in Spain who were at risk for having heart problems for five years to see how dietary changes might help. Their findings were published online Monday by the New England Journal of Medicine.