Hi Cimart,
I'm hypo and have been on 0.075 levothyroxine for 8 years now. I lost 25 lbs on Atkins last year no problem, except that I slipped and regained it all. So, yes you can lose. I asked my endocrinologist if it could make me have a weight problem and he said no, not now that I'm on medication. (I never really believed him.) But then again, that doesn't really help matters -- to not believe him. I say, ask your endocrinologist. Keep the faith, and good luck,