Rapidly changing ideas about what’s healthy are causing strong headwinds for supermarkets. WSJ’s Ken Brown breaks down 3 things they’re doing right. Photo: Getty Images.

Following is a transcript of the video. Narrator: Here's a loaf of Italian bread in an East Coast supermarket chain. It's in aisle 12, the bread aisle, surrounded by other types of bread.

A plastic-free aisle dispels all that. Finally we can see a future where the public have a choice about whether to buy plastic or plastic-free. Right now we have no choice.” A Guardian report in ...