"The American Way of Eating" by Tracie McMillan

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  When journalist Tracie McMillan saw foodies swooning over $9 organic tomatoes, she couldn’t help but wonder: What about the rest of us? Why do working Americans eat the way we do? And what can we do to change it? To find out, McMillan went undercover in three jobs that feed America, living and eating off her wages in each.

Her book is The American Way of Eating: Undercover at Walmart, Applebee's, Farm Fields and the Dinner Table.