Son’s interests and appearance have changed

DEAR ABBY: Our 23-year-old son, “Ed,” was clean-cut, into working out and staying healthy, watched his diet — he even joined a gym and was going every week. Ed has been dating a girl, “Emily,” who is the complete opposite. She’s probably a hundred pounds overweight. She’s also dirty, (when she comes here, there have been days she doesn’t take a shower).