It's hard to say for sure how many calories Santa Claus consumes on Christmas Eve, but it's estimated that he consumes around 6,000 calories. This is due to the fact that he has to travel around the world in one night, delivering presents to children. To fuel his journey, he needs to consume a lot of food and drinks, such as milk and cookies. Santa is a jolly fellow, so he doesn't need to worry too much about counting calories. But if he did, he would probably have a hard time fitting down chimneys!