First of all, and I may make some women on here mad.
Welcome to the life of a guy dating a girl. My fiancé constantly complains about her weight(and she's not fat, not even close) I tell her that she isn't fat, she always disagrees. So when she complains about her looks, I usually stay quiet now, except I did come up with a list of work outs she could do to "tone" up as she requested. But ONLY do this if she asks for help, if you do it out of the kindness of your heart, she will think you are calling her fat