You don’t directly encounter calories, carbohydrates, fats, and proteins. Even at the level of chemistry, real foods have far more to them. We may think of a chicken breast as just a source of protein. In truth, it’s a complex matrix of hundreds of different elements and compounds, of proteins and fats, of the history of a specific chicken—a history it retains even when it is grilled and served to us with broccoli and cauliflower.