Stories by Weight Watchers International said on Monday that it has signed a five-year deal with Oprah Winfrey, former talk show host.

Winfrey, a co-owner of OWN: The Oprah Winfrey Network, is paying about US$43.2 million for a 10 per cent stake in the weight-loss company.The deal is already paying off: Weight Watchers shares have more than doubled after the partnership was...