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Nutrisystem, Inc.
FounderHarold Katz
Area served
USA and Canada
Key people
Dawn Zier, President and CEO
Productsweight loss, weight management, nutrition
Servicestelephone, internet and mobile counseling for weight control
ParentTivity Health

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.[citation needed]

In 2010, the company's mobile platform was launched amidst allegations that Nutrisystem had stolen the technology from WebDiet, Inc., a Silicon Valley startup.[1][2] In 2012, Dawn Zier joined Nutrisystem as CEO.[3]

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.[4] Reviews of the Nutrisystem program criticize the company’s approach as being not conducive to long-term weight control and expensive.[5]

In 2015, they acquired the South Beach Diet brand.[6] In December 2018, Tivity Health announced that they would acquire the Nutrisystem brand.[7]


  1. ^ Brandy, Shaul (24 April 2015). "Nutrisystem Launches Weight Loss Platform on IOS". AdWeek SocialTimes. Retrieved 18 May 2015.
  2. ^ Fair, Matt (1 July 2014). "Nutrisystem Accused of Stealing Rival's Diet Mobile App Technology". Law360. Archived from the original on 22 May 2015. Retrieved 18 May 2015.CS1 maint: BOT: original-url status unknown (link)
  3. ^ Key, Peter (5 November 2012). "Dawn Zier named president/CEO of Nutrisystem". Retrieved 2019-11-27.
  4. ^ Gudzune, KA; Doshi, RS; Mehta, AK; Chaudhry, ZW; Jacobs, DK; Vakil, RM; Lee, CJ; Bleich, SN; Clark, JM (7 April 2015). "Efficacy of commercial weight-loss programs: an updated systematic review". Annals of Internal Medicine. 162 (7): 501–12. doi:10.7326/m14-2238. PMC 4446719. PMID 25844997.
  5. ^ Metcalf, Eric (February 6, 2017). "Nutrisystem Diet Plan Review:". WebMD.
  6. ^ Hilario, Kenneth (18 December 2015). "Nutrisystem acquires diet brand for $15M". Retrieved 2019-11-27.
  7. ^ Hammond, Ed (10 December 2018). "Tivity Health Plunges With $1.3 Billion Nutrisystem Deal". Bloomberg. Retrieved 2019-11-27.

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