Popper,
From my personal experience
, I am monitored through a Medifast Doctor and I had Hypertension, Asthma and Gastric Reflux when I started the program. I had a physical before beginning and went to my doctor every two weeks for the first several months which turned out to be important because I lost alot at first and started having bruises for no reason and my doctor kept an eye on my blood work because rapid weight loss can cause those types of problems (which I didn't know) and the extra personal advisor watching me helping me really gave me a reason to stick with the program and also It reassures me that my body is becoming healthier. Now I am off all my medications except my Blood pressure medicine which the dose has been cut in half. My blook work is wonderful compared to before and my doctor is so encouraging and supportive. I love this forum too and it helps me to have both. My doctors office sells the medifast but I order myself online because the selection is better and when you buy as much as I do its cheaper.
If you have any health problems as other have said it would be best for you to be under a doctor's supervision.
Best of luck to you which ever way you choose to Medifast.
Julie Ann