Food, like anything else, lives in the physical world and obeys the laws of physics. When you whisk together some oil and a little bit of lemon juice - or, in other words, make mayonnaise - you are using the principles of physics and chemistry. Understanding how those principles affect cooking lets you cook better.
People aren't quite sure what it means when a book is a Booker Prize winner. They're not quite sure what is being recommended, what literary values it stands for, because every year it stands for something different.