Hi all,
I am in desperate need of advice/guidance. I successfully lost 120lbs on Ideal Protein last year, and was able to keep my weight within 5lbs for about four months. Then I had an unexpected and unexplained 20lbs weight gain in about two weeks. I went back on the program (using alternatives), and lost most of that just before the holidays. Yay!
After the holidays, I was up 20lbs again, so went back on the program. Since then have gained another 25lbs in two months -- all while on Phase 1.
I saw my doctor back in October when the initial unexplained weight gain happened, and he told me that was definitely not normal, ran a bunch of blood tests as he suspected thyroid issues given my laundry list of other recent symptoms, but everything came back clean.
Given the dramatic increase of weight, even while on a calorie-reduced diet, I have made another appointment (had to be persistent as he says 'everything is fine and I shouldn't worry').
Apart from thyroid issues, what else could this be? I'm hoping most of it is water weight, as I feel swollen (although don't necessarily look it), and my stomach is so distended most days now that I look about 6 months pregnant.
Has anyone else experienced something like this, and how did you get it resolved?

You've done fabulously! I never heard of this happening. If your doctor doesn't investigate further, I would definitely get a second opinion from an endocrinologist. There are a lot of reasons for retaining fluid, which it sounds like you are experiencing.