I want to talk about junk food. You know, the candy bar that tastes really good but does absolutely nothing for your body's nutritional needs. The thing that makes the candy bar bad is not what it has - it's not the fat or the salt or the sugar or the calories. What makes junk food bad is what it doesn't have. Junk food lacks essential ingredients that our bodies require in order to be healthy, strong, fit, and eventually even to just survive. A person eating a diet consisting entirely of junk food would eventually starve to death (the technical term is malnutrition).