Winfrey leaving WeightWatchers board, donating all of her interest in the company to a museum

Former talk show host Oprah Winfrey is leaving WeightWatchers board of directors and donating all of her interest in the company to a museum. Shares of WW International Inc. tumbled more than 23% in Thursday morning trading. Winfrey, who told People magazine in December that she was using a weight-loss medication, has served on the company's board since 2015.