How you cook your fish makes a big difference to your heart. Bake it or grill it instead of frying to cut down on artery-clogging saturated fat. Bake delicate cod, spiced tilapia, or lemony grouper. Throw a firm fish on the grill: snapper, sea bass, or halibut. Compared with fried fish, you'll save about 70 calories and half the saturated fat per serving.