Seriously... None of this, "I lost 30 pounds last month, woohoo" BS. What am I supposed to say to that? "Great job, I'm happy for you. Everything I've read/heard says that's not a healthy way to do it and it's unlikely to stick, but I want to be supportive and who wants to hear debbie downer talking negatively about the achievement you just accomplished so I'll bite my tongue and swallow my concern and hope it all works out in the end."