Christmas can be a difficult time if you're trying to lose weight. It's all the parties, the mince pies, the chocolates and of course alcohol which make it so hard to stay on track. The usual response is to think "I'll just deal with my weight after Christmas". But do you really want to get to New Year's day, step on the scales and see that they're up five pounds? Of course not.
Alcohol is ubiquitous at this time of year. Abstinence may make you feel virtuous but can also be dull. If you do drink, I'd advocate men avoiding beer. Beer increases levels of an enzyme called aromatase. This converts testosterone into oestrogen and leads to fat deposition around the pectoral - the dreaded man boobs. Stick to a few glasses of good quality red wine instead.