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If you like salmon...
Try: Sardines. Once you get past their fishy reputation, you'll find that sardines are nutritional powerhouses. A three-ounce serving has more calcium than eight ounces of milk, almost as much potassium as a banana, and as much magnesium as two cups of raw kale. "Sardines—the fresh fish, not the ones in a can—are delicious," says Isabel Smith, a New York–based registered dietitian who pan-roasts them with garlic, tomatoes and spinach. "If you're turned off by the whole fish, ask the fishmonger to fillet them for you"—so you're off the hook.