Lowest: Around 130 when I entered college at 18 (in 1989 - ugh)
Highest: 230 in spring of 2008
In 1994, when I lived overseas and was happier, walking a lot, going out clubbing all the time...I got down to low 150's
In 1999, I went from 196 to 160 -- so that was the thinnest I got while trying to lose weight