By Caitlin Dewey

The 4,500 people of Musselshell County, Mont., collectively buy the least healthful groceries of any county in the United States. Their baskets are loaded with fat and sugar, Nielsen data show. They aren’t big on fiber or protein.

There’s a debate among economists and public health advocates over why communities like Musselshell tend to eat so poorly. For years, advocates have argued that it’s largely a problem of access: Consumers eat junk because they can’t afford healthful foods or can’t find them in their communities. …

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