David,
I can't explain it either, but I'm in the same place as you. I used to only eat one meal a day and hardly ever snacked and could gain weight easily. I'm about 10 pounds down from my pre weight, I eat 3 meals a day now and snack on just about everything and haven't gained any weight for a while now. I do eat healthier now than I used to.
As always you are blazing the path for me on after treatment issues.
Tim
P.S. Great job on the article. Your a good man and are doing a lot for the cause.