Audrey Tinline looks at the political and economic history behind having a great big meal with a large group of people. We find out what happens to your body when you eat too much: the science of over-eating.We look at how festive food has been used as a hallmark of social and political dominance - beginning with how it came to feature so prominently in still life art. And how the recipe for a the British Christmas pudding was hijackaed as a stealth marketing tool for the Empire.