My personal experience with Medifast:
In November 2003 I weighed 340 lbs. I was on the Medifast program for five months and lost a total of 70 lbs. I liked the program--it fit in my schedule and the results were quick. However, I had side effects from it -- the main ones being hair loss and heart palpitations. I ended up putting 50 lbs back on (back to 320). Now I'm working on getting it off with a lifestyle change and NOT a quick fix.
I still use shakes for snacks, but not my main source of food.
One day at a time is more than just a saying.....
First goal: Back under 300!