Excerpt: CHRISTMAS is the most fattening time of the year. There are claims that the average Westerner will consume 6,000 calories on December 25th, well over twice the recommended daily intake for men and more than that for women. He or she could put on nearly two kilos in the last week of the year. Short winter days and too much slouching in front of the television accounts for some of that. But the main cause of festive obesity may well be sugar, an essential ingredient in Christmas pudding, brandy butter, chocolate, marzipan, mince pies and alcohol.