" Consider the example of saturated fat. This nutrient is widely considered to be bad, but the human body uses saturated fats in all kinds of helpful ways. Saturated fat is good. It just so happens that the modern diet contains too much of it. In most cases, what we really mean when we label a certain nutrient bad is that we tend to consume it in excess. "

― Matt Fitzgerald , Racing Weight: How to Get Lean for Peak Performance