Complaint / review text:
I used this program to lose about 40 lbs 4 years ago. It took about 10 weeks to do it. During the program my skin thinned and wrinkled and my hair turned gray almost overnight. I also noticed my voice changed. These things I didn't associate as side effects of the diet until later. This diet is based on Soy protein. I researched this later and found out how bad Soy is especially for men. It produces estrogen which I don't have to tell you has detrimental effects on men. During the diet I probably lost 1/3 of my arm muscle I guess because the diet is basically a starvation diet with drastic calorie restriction. One other thing about Soy protein is that it damages the Thyroid. You can find plenty of data online about this. For me it resulted in taking thyroid medication something that was not an issue before the diet.
Since the diet I fight every day to keep the weight off mostly by denying myself food. If I eat at the level of a normal guy my age I quickly gain weight. I blame the diet for destroying my metabolism to the point that my body just can't use much food. So expect the joy of eating to be a thing of the past. Turns out I work with two guys who have also used this diet. One before and one at the same time as me. The guy who used it earlier than I gained all the weight he lost and then some within months of stopping. The other guy is gaining the weight back slowly like me and is about back to 2/3rds of what he lost. On him it shows mostly in the belly. For me I've gained back 2/3rds too even with the constant battle with food and have also kept the side effects of a low thyroid and slow metabolism.
I checked out other diets similar to Medifast. They too use Soy protein so I would expect similar side effects. I've read they use Soy because it's the cheapest protein available. There is a lot of controversy about soy which tells me there are problems. I try to avoid it these days. Check this out. I read several places that soy beans crops are heavily treated with pesticides. Some say it is the most heavily treated crop. One more reason this diet may have long term side effects. Pesticides effect the Thyroid too. Maybe if pressure is put on these diets they will change their formulas to a more acceptable protein that isn't so controversial. Bottom line for me is if you're a guy don't do this diet.