Oh wait, that sounds like a scam, doesn't it?
Thankfully, the Federal Trade Commission thought so as well. Under a proposed settlement with Diet Coffee, Inc., the makers of Slim Coffee, the company is forbidden "from claiming that any product enables users to lose substantial weight without reducing caloric intake or increasing physical activity." The settlement also contains nearly a million dollars in monetary damages, but those have been suspended because the defendant is unable to pay.
The company advertised their snake oil on popular television networks, radio stations and in newspapers. That just serves as a reminder that some ad-supported businesses care more about their revenue than the well-being of their customers.