I've been lurking here a while now, I might as well come out of the closet.
In May 2011 I took my class III physical and weighed 270, way, way too high for 5' 8".
It didn't help that I have the world's most sedentary job (software developer). At place that has a large well stocked free kitchen full of every kind of junk food.
In the summer of 2012 I swore off the free junk food and got a CPAP machine. That's when I started making slow but steady real progress.
By Christmas 2012 I was down to about 254, which was still ridiculous, but at least I lost a pound or two over the holidays.
On 1/17/2013 I went on the Medifast plan and the results have been astonishing. According my knee doctor, between Dec 2011 and early March 2013 I lost exactly 50 pounds. About 35 of that was since January.
Medifast is a great plan, especially for people like me who have a fairly predictable schedule.
It boils down to eating six or seven times a day, drinking lots of water, and consuming a diet of about 1000 calories and 100 grams of carbs daily. Five of the meals are purchased from
Medifast, two ('lean' and 'green') you make yourself.
I can tell you more if you're interested, but this plan absolutely works, and after the first week to ten days you don't feel like you are on a diet anymore. I least I don't. After that fairly tough first week I find I'm never truly hungry, and in fact often have a hard time eating all the food they want you to eat. Very occasionally I have cravings, but so far I haven't fallen off the wagon.
After three months I'd lost ~37 pounds, +/- 1 pound.
I have way more energy now that I'm not carrying a fifty pound bag of crap with me every day. I know that as long as I stay on the Medifast plan I'll average losing 3 or 4 pounds a week.
I am concerning about transitioning off the plan. Once I get to my as-yet-to-be-determined final goal weight I'm worried that the real hard work will begin.
I'm doing fine now, it's when I hit 'goal' that I'm sure I'll need all the support I can get.