Hi Jude: I'm with Dave on this one. I've been on several different LA meds over the years I've had CP and I'm on
Methadone now. I haven't gained any weight to speak of, but I weighed about 160 when I went on it and today I'm about 170. I too, walk for excercise, and I'm on SSD so I'm the house husband. I take care of all the running errands and store, so I stay pretty busy. I just finished the weekly laundry.
Like Dave said, if you stay reasonably active and don't do the "Bon Bon" thing, you should be ok on your weight.