When I started running regularly back in July last year, after 6 weeks or so of running in 90-degree temperatures, I lost about 5lbs, going from 183 to 177.
It's January 21st, and I am three weeks into 'dry January', my annual attempt to survive a month without booze. I've lost 6lbs in that time. I'm not a weight watcher per se, but thought this was an interesting stat none-the-less.
I can't see myself giving up beer, or wine for that matter, for the long term. But if you're putting on weight and don't know why, check your alcohol consumption.
