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Product typeDietary supplement foods
CountryUnited States
Introduced1977; 46 years ago (1977)
MarketsU.S., UK, Republic of Ireland, Canada, France, Germany, Iceland, Latin America
Previous ownersThompson Medical Company, Unilever

SlimFast is an American company headquartered in Palm Beach Gardens, Florida, that markets an eponymous brand of shakes, bars, snacks, packaged meals, and other dietary supplement foods sold in the U.S., Canada, France, Germany, Iceland, Ireland, Latin America, and the U.K. SlimFast promotes diets and weight loss plans featuring its food products.

There is mixed evidence on the effectiveness of the diet, although it appears to function no better than behavioral counseling.[1]


SlimFast was started in 1977 as a product line of the Thompson Medical Company, founded in the 1940s by S. Daniel Abraham. Thompson Medical also sold the controversial weight loss dietary supplement Dexatrim.[2][3] In 1987, Abraham took the brand private, and it was acquired by Unilever in 2000.[4] In 2014, Unilever sold SlimFast to Kainos Capital.[5] After the sale, KSF Acquisition invested with Kainos Capital in order to take responsibility for the SlimFast brand in the UK, Ireland and Germany.[6]

In 2018, Glanbia Plc. acquired SlimFast from Kainos Capital.[7]

On December 3, 2009, SlimFast recalled all of its canned products due to possible bacterial contamination.[8] The company stated that it had halted production until the cause was discovered.[9] No further problems or issues have been noted. In 2011, SlimFast stopped producing cans and has since used plastic bottles.[10]


Original (1987–2004)[edit]

SlimFast was originally just a diet shake product line. It consisted of chocolate, strawberry, and vanilla shakes meant to replace breakfast and lunch. The company suggested customers eat a low-calorie dinner. Usually, dieters would pick a low-calorie frozen dinner brand such as Lean Cuisine or Weight Watchers, as the SlimFast diet was a convenience product line that offered none of its own dinner products. Later, in the mid-1990s, SlimFast began offering meal bars that could be used as meal replacements.[11]


In a 2009 study involving 300 overweight and obese males and females aged 21–60 years published by Cambridge University Press, the SlimFast programme achieved weight losses of between 5 kg (11 lbs) and 9 kg (19 lbs) after six months compared to a control diet. The results were comparable to that of both the Weight Watchers 'Pure Points' programme and Rosemary Conley's 'Eat yourself Slim' Diet and Fitness Plan.[12]


  1. ^ Gudzune KA, Doshi RS, Mehta AK, Chaudhry ZW, Jacobs DK, Vakil RM, et al. (2015). "Efficacy of commercial weight-loss programs: an updated systematic review". Ann Intern Med. 162 (7): 501–12. doi:10.7326/M14-2238. PMC 4446719. PMID 25844997. Review in: Kahan, Scott; Theim, Kelly (2015). "Review: Some commercial or proprietary weight-loss programs increase weight loss". Annals of Internal Medicine. 163 (4): JC8. doi:10.7326/ACPJC-2015-163-4-008. PMID 26280443. S2CID 1586172.
  2. ^ "Our Brands: Foods: SlimFast". Unilever Canada. Retrieved 2007-05-28.
  3. ^ "History: SlimFast Foods Company". Funding Universe. Retrieved 2011-07-18.
  4. ^ Branch, Shelly; Beck, Ernest (2000-04-13). "Unilever Buys Ben & Jerry's, SlimFast for Over $2.5 Billion". Wall Street Journal. ISSN 0099-9660. Retrieved 2015-04-19.
  5. ^ Stynes, Tess (2014-07-10). "Unilever Sells Slim-Fast Brand to Kainos Capital". Wall Street Journal. ISSN 0099-9660. Retrieved 2015-04-19.
  6. ^ "Commercial agreement signed with KSF Acquisition". Proactiveinvestors. Retrieved 11 January 2017.
  7. ^ "West Palm Beach-based CEO Tisi plans Slim-Fast makeover". mypalmbeachpost. Retrieved 2018-05-29.
  8. ^ "Recall". SlimFast. December 3, 2009.
  9. ^ "Slim Fast canned drinks recalled by Unilever". NY Daily News. Associated Press. December 5, 2009.
  10. ^ "Slim-Fast loses cans in bottled makeover". Drugstore News.
  11. ^ "History of Slim-Fast Foods Company – FundingUniverse". Retrieved 2019-04-19.
  12. ^ Morgan, LM; Griffin, BA; Millward, DJ; Delooy, A.; Fox, KR; Baic, S.; Bonham, MP; Wallace, JMW; MacDonald, I.; Taylor, MA; Truby, H. (2009). "Comparison of the effects of four commercially available weight-loss programmes on lipid-based cardiovascular risk factors". Public Health Nutrition. 12 (6): 799–807. doi:10.1017/S1368980008003236. PMID 18647427. S2CID 2256339.

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