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The Diet Book is a key item which appears in Super Paper Mario.

In Super Paper Mario[]

The Diet Book belongs to Hagra of The Underwhere. Hagra lent this book to a D-Man a while ago and wants it back, but she is too old to retrieve it herself. When the heroes agree to help her out, Hagra warps them to the D-Man with the Diet Book. The D-Man gives up the Diet Book, saying it was just a fad anyway. When the Diet Book is given back to Hagra, she gives the heroes the Door Key.

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