A blended fruit drink is an easy way to get a head start on your five servings of fruit and vegetables a day, especially if you keep your freezer stocked with fruit and your refrigerator full of juice and low-fat or nonfat yogurt. And a smoothie is just about impossible to mess up. Here's a raspberry-and-banana version that will have you bouncing in your slippers. Ripe bananas are full of potassium and vitamin B6, and they give smoothies sweetness and texture. Berries are a nice addition, adding color, flavor, and vitamin C.