I'm with you. I know a woman on a modified Atkins type diet who's lost something like that in four weeks.
Maybe the key word is "avereage." I mean, you know the one about the statistician who drowned, wading across a river with an "average depth" of four feet?
Dan
Hah! But seriously, I know several people who lost 40-60 lbs in 6 months. 15-20 lbs seems insignificant when you are 280.