Which vegetables should you buy at your local natural or organic food store to make the healthiest salad?

According to Adam Drewnowski, PhD, director of the nutritional sciences program at the University of Washington, the following five produce selections  provide the most nutritional bang for the fewest calories:

Romaine: Full of potassium, which can help lower blood pressure. Additional nutrients include folic acid, beta-carotene and vitamin C.

Bell Peppers: Loaded with vitamins A and C, plus folic acid (a B vitamin that helps the body make healthy new cells).

Spinach: This leafy green is rich in vitamin K, which promotes bone health. It’s also a great source of vitamins A, B6, C and E, as well as beta-carotene fiber, calcium and iron.

Tomatoes: Contain lycopene, a cancer-fighting antioxidant, as well as vitamin C and some B vitamins. Try any of the various colors available.

Broccoli: Contains phytochemicals, substances found in produce that can help prevent heart disease and certain types of cancer. Added nutrients include vitamins A, C and K, as well as calcium, folic acid and fiber.

Recommended Cookbook: Fresh Maine Salads: Innovative Recipes from Appetizers to Desserts