NEW YORK — Publisher G.P. Putnam’s Sons has signed a deal with “Super Size Me” director Morgan Spurlock to pen a book expanding on the doc, which tells the cautionary tale of his life-endangering binge on fast food.

Hardcover will be published in early 2005. Parties would not disclose the amount of Spurlock’s advance, though it’s rumored to be in six figures.

“Morgan Spurlock is a brilliant commentator on American culture — the kind whose insight and wit will obviously translate very effectively into the book medium,” Putnam’s Sons VP and editorial director Jennifer Hershey said.

“Super Size Me,” which opened in eight U.S. cities earlier this month, is among a new crop of documentaries generating widespread media interest and box office dollars. Doc is currently in release through Samuel Goldwyn Films and Roadside Attractions.

Hart Sharp Video has acquired domestic home entertainment distribution rights for the film, with plans for a fall release.

Spurlock and the Con produced “Super Size Me”; J.R. Morley and Heather Winters exec produced.