NEW YORK (AP) — Would you put down that bag of chips if you saw it had 170 calories? What if the label said it would take 16 minutes of running to burn off those calories?

Health experts for years have pushed for clearer food labeling to empower people to make better choices. In the U.S., a recent regulation requires calorie counts on packages to be bigger. Red, yellow and green labels signal the healthfulness of some foods in the United Kingdom. But with obesity rates persistently high, researchers are looking at whether more drastic approaches could help.

One attention-grabbing idea being ex...