Oprah Steps Down from WeightWatchers Board, Sending Shares Plunging
- Oprah Winfrey is stepping down from WeightWatchers board after 9 years
- Her departure sent WeightWatchers shares plunging 25% in premarket trading
- Winfrey disclosed last year she uses prescription weight-loss drugs herself
- She is donating her financial stake in WeightWatchers to African American museum
- WeightWatchers has moved into prescription weight-loss drug business amid competition