After he was sentenced for illegally possessing a firearm, Albert "Prodigy" Johnson, of the hip-hop duo Mobb Deep, discovered how hard it was to eat healthy behind bars. His new cookbook tells the story. Teddy Wolff/Infamous Books hide caption

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Teddy Wolff/Infamous Books

Ramen will buy anything from smuggled fruit to laundry services from fellow inmates, a study at one prison finds. It's not just that ramen is tasty: Prisoners say they're not getting enough food. DigiPub/Getty Images hide caption

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DigiPub/Getty Images

Prisoners build an organic vegetable garden in the prison yard of the medium security unit at San Quentin State Prison in December. Kirk Crippens/ Insight Garden Program hide caption

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Kirk Crippens/ Insight Garden Program
Lisa Brown for NPR

Food As Punishment: Giving U.S. Inmates 'The Loaf' Persists

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Sean Kelley, senior vice president at the Eastern State Penitentiary, displays a plate of "food loaf," a punishment food currently served in Pennsylvania prisons. Over the weekend, the historic penitentiary, now a museum, served visitors sample meals from the 1800s, 1900s and today. Matt Rourke/AP hide caption

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Matt Rourke/AP