Passion fruit packs 5 grams of protein per cup but isn't a total 'game

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Protein buffs are going bananas over a tropical surprise. Passion fruit delivers more protein than any other in its class – but dietitians say it's not the ultimate muscle hack.

While most fruits offer only 1 to 2 grams of protein per serving, a single cup of passion fruit contains 5.2 grams of the muscle-building macronutrient, according to the U.S. Food and Drug Administration (FDA).

Protein is vital for growing and repairing cells, tissues and organs, according to the Centers for Disease Control and Prevention (CDC).

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"Passion fruit tops the fruit protein list," Miami-based performance dietitian Tony Castillo, MS, RD, told Fox News