SlimFast Commercial 1994

 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. In 1987, Abraham took the brand private, and it was acquired by Unilever in 2000. In 2014, Unilever sold SlimFast to Kainos Capital. After the sale, KSF Acquisition invested with Kainos Capital in order to take responsibility for the SlimFast brand in the UK, Ireland and Germany.

In 2018, Glanbia Plc. acquired SlimFast from Kainos Capital.

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