Excerpt:
About 30 percent of heart attacks, strokes and deaths from heart disease can be prevented in people at high risk if they switch to a Mediterranean diet rich in olive oil, nuts, beans, fish, fruits and vegetables, and even drink wine with meals, a large and rigorous new study has found.

The findings, published on The New England Journal of Medicine’s Web site on Monday, were based on the first major clinical trial to measure the diet’s effect on heart risks. The magnitude of the diet’s benefits startled experts. The study ended early, after almost five years, because the results were so clear it was considered unethical to continue.

The diet helped those following it even though they did not lose weight and most of them were already taking statins, or blood pressure or diabetes drugs to lower their heart disease risk.

To make the diet choices more sustainable each element has an eco friendly alternative:

Olive oil, Fruits, Vegetables, Nuts - Buy Organic and local (like farmers markets).
Fish - farmed sustainably.  Use the tools here to find more.
Wine - Organically grown and processed at a sustainability certified winery