This website offers some insight.
http://www.halls.md/ideal-weight/body.htm
If I type in my starting weight (285) it says the "people's choice" weight for me is 192. However, if I type in 200 (as my pretend current weight), then the people's choice weight for me is 156.
I think it can be hard for folks who have always seen you as "a fat girl" to wrap their minds around a real skinny minnie image. Plus I know most people are terrible at guessing weights. There's no question in my mind that when i was 285 pounds and very obviously obese, that friends would have been shocked if I said I wanted to lose 135 pounds. "oh no, that's too much" etc even though it would just get me to the top of a healthy BMI.