Nutrisystem, headquartered in Fort Washington, Pennsylvania, is a commercial provider of weight loss products and services. Initially, the company offered weight loss counseling and products in brick and mortar centers. In 1999, the company moved to a direct-to-consumer business model, selling its products and programs on the Internet and through a call center via 1-800 numbers.
As of 2014 evidence was lacking that Nutrisystem products help with long-term weight loss; there was tentative evidence that at three months it resulted in 3.8% more weight loss than a control group. Reviews of the Nutrisystem program criticize the company’s approach as not conducive to long-term weight control and expensive.
In 2010, the company's mobile platform was launched amidst allegations that Nutrisystem had stolen the technology from WebDiet, Inc., a Silicon Valley startup. In 2012 Dawn Zier joined Nutrisystem as CEO. In 2015 they acquired the South Beach Diet brand.
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