Seemingly overnight, Americans have become obsessed with pumping as much protein as possible into every drink, snack and meal.Elizabeth Dunn, a writer and contributor to The Times, explains the origins of this latest nutrition craze.Guest: Elizabeth Dunn, a writer and contributor to The New York Times.Background reading: 

• The David bar, basically a protein Scud missile wrapped in gold foil, has had breakout success. But can the trend last?
• Read a fact-check about some of the big claims made about protein.

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