Medifast, Inc. (NYSE: MED) is an American nutrition and weight loss company based in Baltimore, Maryland.

In 2002, Retired Marine Colonel Bradley T. MacDonald, Chairman of the Board at the time, along with clinical specialist Dr. Wayne Scott Andersen, created Take Shape For Life as a personal Coach to the Client system and the company's “Habits of Health System.”[10] In October 2010, Medifast was ranked number 1 on Forbes magazine's list of "America's 100 Best Small Companies".

In return, LifeMD will provide its patients with an independent Medifast Coach and additional lifestyle support services for weight management.

[16] In September 2012, Medifast's subsidiary, Jason Pharmaceuticals, paid a $3.7 million USD civil penalty for false advertising.

The Federal Trade Commission and United States Department of Justice said that advertisements for the "Medifast 5 & 1 Plan" low-calorie diet told consumers they could "lose up to 2-5 pounds per week", and that these weight-loss claims lacked a reasonable scientific basis, and were unsubstantiated.