Here’s a chart that tells you how many calories you will consume on Christmas Day before alcohol is taken into account. While people in the United States and the UK will guzzle down 3,500 calories on Christmas day – even without the booze – the Japanese, Lithuanians and Czechs will have a healthier outlook and holiday feasts that range from 1,400 to 2,000 calories according to Dr. Wayne Osborne who takes calories into account at treated.com.