Too much exercise may harm your health

Dr. Allen Frances, co-author of the previous version of the "Diagnostic and Strategic Manual of Mental Disorders" -- known as "the psychiatrist's bible" -- discusses new, controversial changes to the text. Frances is the author of a new book called "Saving Normal."

Dr. Elisa Port, of New York's Mount Sinai Hospital, talks to the "CBS This Morning" co-hosts about Angelina Jolie and what you should know about mastectomies and BRCA gene testing.

CBS News medical contributor Dr. Holly Phillips explains the process and pros and cons of genetic testing for women concerned about their risk of developing breast or ovarian cancer.

Health officials are getting worried that two new viruses could spread around the world. Vanderbilt University's Dr. William Schaffner, former president of the National Foundation for Infectious Diseases, discusses the threat with the "CBS This Morning" co-hosts.

Angelina Jolie's mother died of breast cancer when she was 56-years-old, and now, the star reveals she had a double mastectomy to protect herself from the same fate. Dr. Holly Phillips discusses Jolie's choice with her family history and a inherited genetic mutation.

CBS News medical contributor Dr. David Agus discussed Angelina Jolie's revelation in the New York Times, and what it means for her and for other women in terms of breast and ovarian cancer.