Weight Watchers stock soars as Oprah ad begins to air
The weight loss company's shares are soaring as a TV commercial starring Winfrey begins to air.
Weight Watchers stock has more than tripled since October when Winfrey bought a 10 percent stake in the New York company.
Besides the new ads, Weight Watchers has also made changes to its plans to better fit in with Winfrey's message of living a healthy and happier life and not just focusing on weight loss.