Oprah Winfrey is leaving her WeightWatchers partnership behind after nearly a decade. The talk show veteran, 70, who recently admitted to using a weight-loss drug to shed her unwanted pounds, says even though the tie-in is being severed, she still plans to work with its CEO to “elevate” the “conversation” around obesity. A WeightWatchers statement said Oprah’s decision was “not the result of any disagreement” or “any matter relating to the company’s operations, policies or practices”. The company’s CEO Sima Sistanim, 42, said on a recent call with investors: “Oprah is an inspiring presence and…