BODY HEALTHY MAINTAINANCE
The engine view gets a few things right. We put fuel into our bodies in the form of food. And we do burn it off in all the tasks that our body does, the way that an engine burns fuel.
But an engine, like the engine in your car, doesn't get to decide how it burns the fuel. A car's energy burn is all about how hard you step on the gas pedal. Your body isn't like that. Your body is more like a business, as it has an overall goal like any business does. The overall goal of your body is to survive and reproduce, because that's what every organism has evolved to do. But there are many parts and pieces and departments that are in the service of that overall goal.