It has been months since the Oprah book club made an official selection but getting a mention on her show still generates strong sales and an increased print run. Just ask the publishers of diet doctors Michael F. Roizen and Mehmet C. Oz.

The pair appeared on Oprah's show Nov. 2 and since then, their books have occupied the top three spots on the best seller list of Amazon.com.

The books are entitled "YOU: On a Diet" and "YOU: The Owner's Manual."

The publisher of the Free Press, Martha Levin, says the company has increased the print run of "YOU: On a Diet," from 650,000 to 950,000.

That's because customers are buying both the book alone and the book and DVD, thanks in part to Winfrey. Levin says Oprah obviously has a passion for the authors' work.

Roizen and Oz specialize in easy-to-understand guides to healthy living, written with hip, simple language.

Winfrey's support for Roizen and Oz is separate from her book club picks, which virtually guarantees hundreds of thousands of sales.

Her last official selection was 10 months ago, when she chose Elie Wiesel's "Night," her longest hiatus since she suspended the club for a year in 2002-2003.

The Oprah Winfrey Show airs Monday through Friday on WTOK-TV at 4 p.m. and midnight.