Former fast food fanatic Cameron Diaz is following up her 2013 book debut with her new release, The Longevity Book, which is not about how a staple diet of Taco Bell will help you live forever. To promote the book's April 5 release, 43-year-old Diaz posed with the hardcover edition on her Instagram, all while sporting what appears to be no makeup.

I'm so excited to continue the conversation because learning that you can age well, will actually help you age better. If you understand how your body works then you can take action to help keep it in the best possible condition so it can carry you through a long and beautiful life. | Read my full post at @thebodybook #linkinprofile#longevitybook #knowledgeispower #everyoneages

Sources: Us Weekly