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Americans are currently besotted with protein. It’s touted as being good for muscle growth, weight loss, skincare, mental acuity, longevity, and much else besides. It’s sold to men, women, children, the elderly— you can even buy protein for your pets. The protein supplement market alone is worth $21 billion and growing—and extra protein is being added to coffee, cereal, pasta, beer, ice cream, and popcorn. But as frenzied as we currently are about protein, this is not the first protein boom—or even the second. Protein has been promoted as a charismatic, cure-all nutrient for nearly two centuries. In this episode, with the help of Samantha King and Gavin Weedon, the authors of Protein: The Making of a Nutritional Superstar, we look closely at all our protein crazes and their associated protein products—from beef tea to whey powder—and see what they can tell us about our current protein mania.  This episode was produced by Max Freedman. Decoder Ring is also produced by Willa Paskin, Katie Shepherd, and Evan C