Some researchers have found that vegetables like broccoli have fewer good-for-you nutrients like calcium and zinc than they used to. But a new study says that genetics — what plant breeders control — probably isn't the major factor determining nutrient levels.

When researchers dug into Danish cancer data, teasing out cases involving people who'd had cellphones with those who hadn't, they found no increased risk of brain tumors. Swedish researchers also noted in an editorial that national rates of glioma, a brain cancer, hadn't increased since the 1970s.

A report urges the Food and Drug Administration to adopt new food labels that make it easier for consumers to compare the healthfulness of food products. To cut down on confusion, the system would rely on stars, check marks or some other icon to convey a food's nutritional rating.

Teen drivers have fewer accidents as they gain experience. But that doesn't mean they are cutting down on dangerous habits like taking sharp turns and braking quickly, research shows.

Tell Me More's end-of-life series continues with Washington-area 80-somethings talking about the realities of retirement with Michel Martin.