Here are some thoughts. I'm a bit hungover so don't expect it to be funny.
Oh, and I didn't go out almost the whole month. That helped.
After two weeks dry I was 83.7kg, which was probably on target. But I felt I wasn't losing enough, so I made an effort to cut out sugar - no more chocolate, pasta, bread. I think I only had two pizzas in the whole of January.
On the menu came tons of chicken, natural yoghurt, and club salads. On the 1st of Feb I had dropped to 80.8. Wowza!
(I just watched a documentary about a guy who lost 4kg in a month, like me - he was told that half was from fat and half was muscle mass. GAH. Another thing to be paranoid about. I'm going to buy one of those scales that tells you your body fat and muscle mass percentage.)
One-word answer: dry.
I expect to stick to alcohol-free beer in future, but I'll still have red wine. Oh, and tomorrow I'm going to see Robocop, so I'll sneak in some mini bottles of prosecco. "Dead or Alive, you're coming with me!" Action movies are better with booze - that's just common sense.