During her time on the show, when she was exposed to minimal amounts of wheat and gluten, her symptoms had eased significantly. After researching her symptoms, Hasselback diagnosed herself with celiac disease. Following this realization, she went on a gluten-free diet and wrote the book, The G-Free Diet, for those who have celiac disease or who want to explore this healthy diet.

Maria Shriver: Alzheimer’s Disease

The former First Lady of California and award-winning journalist, Maria Shriver, has been a spokeswoman for Alzheimer’s awareness and research for more than a decade. Her crusade began when her father, Sargent Shriver, was diagnosed with the disease. She has continued her work with The Maria Shriver’s Wipe Out Alzheimer’s Challenge, which aims to mobilize American women to stop this disease that affects more than 5 million Americans. Shriver focuses on raising awareness about the disease, while raising funds for research aimed at wiping out the disease and studying why women are stricken at a rate nearly twice that of men. She also focuses on the toll that Alzheimer’s takes on the caregivers who put their own lives on hold to take care of ailing loved ones.

Melissa Etheridge: Breast Cancer

Acclaimed rock singer/songwriter Melissa Etheridge was diagnosed with breast cancer in 2004. After a lumpectomy and multiple rounds of chemotherapy and radiation, the singer found herself in remission, and with a cause: she joined the board of the Noreen Fraser Foundation and took part in “1 a Minute LIVE,” a film that broadcast in theaters in 2010 to raise funds for Susan G. Komen for the Cure.

Etheridge made her return to the stage at the 2005 Grammy Awards, still bald from chemotherapy, and sang the song “Piece of My Heart.” The singer later came under fire when, in 2013, she criticized actress Angelina Jolie’s decision to undergo a double mastectomy, calling it a “fearful” decision, rather than a brave one.

Brooke Shields: Postpartum Depression

After the birth of her first child in 2003, model/actress Brooke Shields began a struggle with postpartum depression. Shields has spoken candidly about feeling depressed and even suicidal as she struggled with the condition that affects up to 15 percent of new mothers. She chronicled her battle in the memoir, Down Came The Rain: My Journey Through Postpartum Depression.