Medifast Inc. is an American nutrition and weight loss company based in Baltimore Maryland. The company owns five subsidiaries Jason Pharmaceuticals Inc. Take Shape for Life Inc. Jason Enterprises Inc. Jason Properties LLC and Seven Crondall LLC.Medifast Inc. is an American nutrition and weight loss company based in Baltimore Maryland. The company owns five subsidiaries Jason Pharmaceuticals Inc. Take Shape for Life Inc. Jason Enterprises Inc. Jason Properties LLC and Seven Crondall LLC.