I have a different slant to add to this. I think when you are a young person, you can get skinny and still look good but if you are an older person like me, I don't want to look older so I want to know when I've reached the point where I still look younger and not gaunt. That point for me is now at 5'4" and 144 pounds. Even tho' I'm not a size 10 or less, I agree with my husband and others that I've gone down far enough. It isn't even difficult for me anymore since I realized that when I eat more, I lose more but there is a point where it doesn't look good any more and for me that was when my BMI was down to 25 and the chart said I am average and not overweight. I think sometimes we can't see ourselves as others see us so we might need the opinions of those we love to let us know when we are thin enough. Just my opinion.
Sharon