pub piss-ups/ Christmas gatherings/sipping beers in front of old re-runs of Dinner Date. Maybe you just want to drop a few mince pie-induced pounds, but can’t bear to embark on another laborious 5k-a-day fitness routine. We get it. The key is to be careful about what you're drinking. Cocktails often have the highest level of calories because of the sugary goodness that make them taste so delicious – a Manhattan has around 160 calories per drink and a Cosmopolitan around 200 calories per drink. Your favourite beer isn't far behind either, with an average of 149 calories per pint. Don't f...