Okay. Easter's almost here, and let's say we've found our moral compass from part I. Could be the Bible, Dr. Phil, Oprah, the opposite of what your parents did, the old Buddhist guy with body odor who cycles at your gym, or the American conscience: whatever feels good. Regardless, everyone has some source for understanding right or wrong; guidelines which tell you that liberating a Chinese person is good, while making a fifth sequel to the Fast and the Furious is not.
Now that you've located this moral center, it tells you that maintaining your body is a good thing. So all that stuff we mentioned before, plus dinosaur fruit snacks, are not good. Just how bad are they? Do you operate on the premise that if something isn't good for you, then you never do it? And if something is good, you do it everyday? Here is where indulgence comes into play.
Anything. And I mean pretty much anything (yes that even includes probing the depths of my inspired fast food wisdom) becomes bad when you do it too much. Or if it is taking too much of your time. The ratio of this danger zone of obsession and cut off point varies with the activity. For example, if you're reading Robert Louis Stevenson to the elderly, you might be able to stretch it for an extra hour without doing any real damage. Conversely, if you've listened to more than 15 seconds of Rebecca Black's song Friday, you're unfit for adult society. I would say in the realm of fast food, it's healthy to aim for once, maybe twice a month.
And yes, I'm aware of the irony of posting a link to Rebecca Black's song while deriding it, so don't bother emailing me about it.