4. "You look great just the way you are."

Variations: "Oh, you don't need to lose weight." "I think you've lost enough." "Just think how great you'll look if you just lose ten pounds."

Why it's unhelpful: Judging the size of someone's else's body is never our business, writer Geneen Roth says. "You may love them, adore them, or be concerned about their health, but what they put in their mouth is not your business."

Better: Respect boundaries. Whether you feel a loved one or friend is too heavy or too thin, your opinion has no bearing on what she chooses to do about her body -- that's the individual's call. Let the person and her doctor decide what's a healthy weight and what to do about it.