By Bob Condor

The Mediterranean diet has been long praised as heart-healthy, even with its fat content from olive oil, fish and nuts. Those omega-3 fats, of course, are healthy and far from the artery-clogging nature of saturated fats and trans fats. Another plus of the Mediterranean diet: Lots of antioxidants from fruits and vegetables.

A new study broadens the health value of those omega-3 fats and antioxidants, along with the fresh produce and whole grains—and don’t forget the feta—that …