I read the article
it was in this week's New Yorker. They controlled for that. What the main researcher is attempting to do is to find out if there's some enclave of rich tall people, but he hasn't found it yet.
According to the article, there are three main growth spurts in a person's life; infancy, childhood, and adolescence. If there are bad circumstances in any one of those periods, it can have a major effect on the final height of the person. He's wondering if the kind of diet that most people in NA have is having an effect (pop, chips, hamburgers, etc). That is, people are getting stunted in their childhood and adolescent growth spurts by the kind of diet they have, not by the lack of diet.
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