On October 16, 2007, Winfrey revealed that she was diagnosed with a thyroid disorder that made her gain 20 pounds. "At the end of May, I was so exhausted I couldn't figure out what was going on in my life. I ended up going to Africa and spent a month with my beautiful daughters there, was still feeling really tired, really tired, going around from doctor to doctor trying to figure out what was wrong and finally figured out that I had literally sort of blew out my thyroid " Winfrey said on her show. She also discusses more about her story in the October 2007 issue of the Oprah Magazine. In 2008 Winfrey decided to become a vegan for three weeks.