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In the midst of preparing for her fall tour, JANET JACKSON will also be writing a book, she tells Billboard magazine.

"Everybody asks me — men, women — how did I do it?" she says. "Even young people will come up to me and they have an issue with their weight and they’re very concerned. So it’s basically my journey."

Janet says the book, which she’s writing with her nutritionist DAVID ALLEN, will serve as less of a how-to and more of an inspirational story.