BLOOMINGTON, IL: The principals behind a State Farm Insurance-sponsored, weight-loss Web site are behind the launch of a grassroots push to coach Americans, especially blacks, into losing a collective 50 million pounds.

The social networking and lifestyle-focused site, http://www.50millionpounds.com/, is a joint effort between State Farm and Dr. Ian Smith, a nutrition expert and media figure. It launched last year with a cross-country tour, featuring rallies and events. Since the launch, participants have claimed to have lost more than 1.5 million ...