Why do we eat what we eat?

Have you ever wondered why we eat in the way that we do? And where our food habits have come from? And what our food choices are actually doing to us?
Every culture and country has different food habits, every family within those cultures and countries will have an array of varied habits. Where do these habits come from and what influences what we eat? Family? Advertising? Laziness? Habit? Money?
Take a look at this short introduction to The Story of Food to kick-start some thinking on this topic: