I would just like to say that your assumption and comment is incorrect. I and many others have put on large amounts of weight in the past while eating the purest 100% raw food vegan diet.
I once gained 21kgs in 9 months, 7 years later I am still not rid of this excess weight, dispite raw food, many fasts and cleanses and lots of exercise, much like the original poster on this thread. It is not helpful to accuse someone of eating junk food when they are obviously doing so much to try and help themselves. Weight gain, as MH says is due to bad circulation, and I don't know if you are aware of this, but junk food is not the only thing in this world that can cause bad circulation.