There is an excellent, albeit long, article over on Precision Nutrition today called "Food Is Not Fuel." It is well worth reading.
It breaks down the very critical non-energy providing (zero calorie) substances in our food that play such a critical role in how our bodies respond. The food you put in sends signals to the body about what it needs to do, or provides substances that help it do that job. Providing energy is only one part of that . . .
It will take some time to read through it, but it is a great list of what food does for you, and why changing your diet (even without changing your total caloric intake) can change how you look and feel and perform.
2 hours ago