Low-fat fish doesn't have to mean low on flavor. This recipe for Caribbean Tilapia from the New Age Health Spa in Neversink, New York, pairs the sweet whitefish with a tangy mango sauce flecked with fresh herbs—all at a swimsuit-safe 128 calories per serving. Tilapia (also called St. Peters fish), says Executive Chef Maria Elowson is "very mild-tasting—a good choice for people who don't really like fish." If tilapia is not available, she suggests substituting halibut or cod. And if seafood doesn't float your boat, try the sauce over tofu, tempeh, or pasta and veget…