I suspect that somewhere between the third mince pie and the first cold turkey sandwich at Christmas , a little voice in your head told you that you should " lose a bit of weight " next year ; that as you staggered from one Christmas party to another , the same voice probably said that it was about time to " cut back on the booze in January " ; and hands up all of you who , as the clock struck midnight , looked at the cigarette in your hand and promised to " quit in the morning . "