Cameron Diaz working on fitness book

In this May 14, 2012 file photo, Cast member Cameron Diaz poses at the Los Angeles premiere of the film "What to Expect When You're Expecting," in Los Angeles. HarperCollins announced Wednesday, August 8, 2012 that the star of "Charlie's Angels," "There's Something About Mary" and other films has an agreement with the publisher for a book on health and wellness. Diaz's book is currently untitled and scheduled for publication in the fall of 2013.[Photo/Agencies]

Cameron Diaz's latest project is all about looking and feeling good.

HarperCollins announced Wednesday that the star of "Charlie's Angels," "There's Something About Mary" and other films has an agreement with the publisher for a book on health and wellness. Diaz's book is currently untitled and scheduled for publication in the fall of 2013.

According to HarperCollins, the book will offer advice to young women about health, fitness, nutrition and general well-being. The publisher says Diaz hopes to "engage and empower" women.

Diaz, who turns 40 later this month, has spoken often about the importance of health and fitness and her desire to share advice.