Made with yogurt, this drink is both refreshing and nourishing. To tell when a banana is ripe, look for tiny brown spots, called sugar spots, on the peel. Combine the first 6 ingredients in a blender and blend until smooth. Pour the smoothie into a large glass and garnish with a lime wedge or banana slice. Serves 1. 215 calories per serving; 8 g protein; 1 g fat; 48 g carbohydrate; 38 mg sodium; 2 mg cholesterol. Recipes from High-Flavor, Low-Fat Cooking by Steven Raichlen (Abbeville Press, $18.95, copyright 1992). Recipe by: Good Morning America