Oprah Winfrey will leave the board of directors of WW, the weight loss company formerly known as WeightWatchers said Wednesday.Winfrey will not stand for re-election to the board during its upcoming shareholder meeting in May. She has been a board member since 2015. “I look forward to continuing to advise and collaborate with WeightWatchers and CEO Sima Sistani in elevating the conversation around recognizing obesity as a chronic condition, working to reduce stigma, and advocating for health equity,” Winfrey said in a news release. Winfrey announced that she would be donating her WW…