Time and time again nuts make the healthy list. They’re full of heart-healthy omega-3s plus muscle-building protein. Their only downfall is their high calorie counts, so be sure to stick within a serving size. Get the most bang for your caloric buck by picking pistachios. “Pistachios give you the most—49 nuts—compared to almonds with 23 pieces or cashews with about 18 nuts,” says Zuckerbrot.