A new radiation treatment for breast cancer is becoming increasingly popular despite lack of good evidence, at least among well-insured Medicare patients, U.S. researchers say.

A leading medical group says there's some evidence that probiotics, or “good” bacteria, may have limited benefits for certain illnesses in children.

The benefits for heart health of eating fish may outweigh concerns over the potential negative impact of increased exposure to mercury as a result, according to a study.

The obesity epidemic has spread to poorer nations, where it almost entirely affects wealthy citizens, while the poor in the same nations still remain underweight, a study said.

The head of the World Food Program said Thursday she saw many children in North Korea who are “losing the battle against malnutrition” during a visit there.

Researchers have uncovered more reason to believe that properly managed diet and exercise can help overweight, obese and severely obese people lose weight, two studies have suggested.

The number of U.S. adults who have diabetes could rise sharply in the next 40 years, from one in 10 today to one in three by 2050, the country's Centers for Disease Control and Prevention (CDC) said Friday.

Bad news for dieters: a new study has found that a chemical found in chili peppers being touted as a weight loss aid may not help as much as its manufacturer would like people to think.

A new government study says most Americans still don't eat enough vegetables, and fruit consumption is actually dropping a little.

Brazilians' waistlines are bulging, belying the country's image as a place of buff sun worshipers and lithe soccer players.