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Nutritionism is a term coined by the Australian sociologist, Gyorgy Scrinis, and popularized by Michael Pollan. It means reducing the value of a food to its content of specific nutrients.
This General Mills cereal advertisement is a perfect illustration of how nutritionism works.

Here is one of the six examples:

Chocolate Chex has more iron than black beans?
This may be a true statement, but it is misleading.
What General Mills is not saying is:
Hence: Nutritionism.