6 year old is talking about wanting to be skinny. I’m very worried.

Hi all, my beautiful, healthy, happy 6 year old daughter has started talking about how she wants to be skinny. The other night she was running in circles and said “when I got tired I just ran some more, because I want to be skinny.” I have no idea where this is coming from as we are a very body positive family and don’t discuss things like this. I’m at a loss and she’s mentioned it more than once now. Help me. via /r/Parenting http://bit.ly/2RHdJ2t