Air-popped popcorn has just 30 calories per cup, and only 35 if cooked with oil. Even lightly buttered popcorn has just 80 calories per cup, making it a low-calorie snack.

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Air-popped popcorn contains a mere 30 calories per cup, and only 35 if cooked with oil. Even lightly buttered popcorn has just 80 calories per cup, making it a low-calorie treat.

Popcorn is one of my favorite snacks, so I feel passionately about the protein popcorn cause. To me, a low-calorie snack with added macros is a great thing — but it still has to taste good.