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. Nutrisystem’s programs have been sold on the QVC television home shopping network since 2001 and in Costco stores since 2009. The company entered the retail arena in 2012 with the launch of its "Everyday" line of breakfast and snack items in Kroger grocery stores. In 2013, Nutrisystem began selling its five-day "Jumpstart" line in Walmart stores. In 2010, the companys 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. Nutrisystem as of 2014 is lacking long term evidence. There is tentative evidence that at three months it resulted in 3.8% more weight loss than a control group. Increasing the structure of a low-calorie diet has been found to improve weight loss when compared to a low-calorie diet of self-selected foods. Use of portion-controlled foods and structured meal plans are two means to that end, both of which are incorporated into Nutrisystems weight control programs. The primary concern related to this approach is long-term sustainability. No studies have compared long-term adherence to structured, versus unstructured, low-calorie diet plans.