Oh, so there are good thoughts that clients are allowed to think, and bad thoughts that must be targeted, are there? Like the old saying, "fight fire with fire", you want to fight dichotomy with dichotomy
Perhaps there is some truth in it. Beginning to gain weight might be the start of a slippery slope that will have consequences the client does not want. I wonder what those consequences might be, what bad things might happen, and how bad they really are.