I stepped on my little Tesco bathroom scale this morning and it said 76 kg. That's 168 lbs. I've never had a reason to distrust this scale – it was more-or-less in sync with my official weigh-ins during my radiation treatment.
Here's the thing: the last time I weighed less than 170 lbs was 1990. I passed it going the other direction while in basic training for the US Army – "bulking up" they called it, as I got in shape. Before that, I had always been a skinny person. And since the US Army, I have always been a fat person. Permanent metabolic changes were either wrought by my army experience or else corresponded with it.
I peaked in 1998 at around 260 lbs (120 kg), with another peak at about the same in 2005.
The key to my current weight is simple: the "amazing cancer diet" works! Just make sure that eating is more painful than exercise, and you're set.