Imagine that a public health authority publishes a report on the nation’s diet. After 22 years of data and a 100-page methodology, it announces the four least nutritious food groups. They are: beverages, snacks, prepared meals and condiments. 

The categories tell you nothing, because beverages include both water and vodka, and snacks include both carrot sticks and deep-fried Mars bars. The four least nutritious food groups are not food groups at all. They are categories with contents differing so much that any encompassing judgement about them is meaningless. 

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