When you’re being productive, you get your job done and feel great. You have the sense that time has slowed down because you made so much progress.
How do you think your body feels when you feed it empty calories?
It wastes time processing those calories, trying to extract nutrients that aren’t there and in a sense, getting frustrated at the lack of accomplishment. The body wasn’t able to do its job; it wasn’t able to grow and it wasn’t able to heal.
In other words, you made your body less productive.
When you eat empty calories, meaning foods with a very few nutrients for the amount of calories they contain, you’re basically wasting your body’s time.