A Turning Point for Ultraprocessed Foods

A new study has found that nearly three-quarters of American adults are now obese or overweight, and there’s growing concern — among politicians, scientists and consumers — about one potential culprit: ultraprocessed foods. Guest: Alice Callahan, a nutrition and health reporter for The New York Times, discusses how these foods came to be such a big part of what we eat, and why that’s so hard to change.