I have written a lot about healthy food choices, so recent articles stressing the benefits of the Mediterranean-style diet caught my eye. Apparently, it is not easy for Americans to switch to this healthier approach, with its emphasis on fish and fresh fruits and vegetables, writes journalist and author Paul Greenberg this week in the New York Times. And the dietary habits we cling to in the U.S. not only affect our own health, he notes, they impact the nation’s approach to farming and education about diet.