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Bill Gates: My 'favorite' author's newest book is a must-read—it shows how food can become more affordable

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Bill Gates ' favorite author has a new book, "How to Feed the World," which he says "will transform the way you think about hunger, food, and what we eat (and don't) Gates is a "devoted reader" of Vaclav Smil's entire catalogue, reading "nearly all" of his published works.

The world produces roughly 3,000 calories-worth of food per person per day, according to the United Nations .