It's generally ludicrous to try to sort foods and nutrients in binary terms into "good" and "bad". Unfortunately, the media (which needs catchy headlines) often does this.
eg. Sodium is a vital component of your nervous system, but it can also harden your arteries. So is it "good" or "bad"?
Also the combination of foods and nutrients makes a difference too. Having an occasional doughnut as part of an otherwise healthy diet probably won't do you any harm. Having an occasional doughnut as part of a diet of fish, chips, pizza and hamburgers might.
Vitamins can be dangerous in excessive amounts. Supplements also probably aren't as effective as taking the same vitamins in their natural form (ie. in food). Conversely it's not always easy to get the full range of necessary vitamins through food (especially when your body is sick or otherwise weakened and its hunger for particular vitamins increases significantly).
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When people see things as beautiful, ugliness is created.
When people see things as good, evil is created.
When the way is forgotten, 'morality' and 'piety' need to be taught.
-Dao De Jing, Chapter 2
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