What if weight loss informed consent is too discouraging?

During the Q&A a physician raised her hand and asked me a question that I’ve been asked many times over the years. “I don’t disagree with the information you presented about the failure rate of behavior-based weight loss attempts, but I do disagree with what you said about informed consent. If I tell patients that there is about a 95% chance that they will lose weight and gain it back then they will never try, what good does that do?”