The incidence of advanced breast cancer among women aged 25 to 39 in the United States has increased over the past thirty years, a study said Wednesday.

Published in the Journal of the American Medical Association, the study found that cases increased from 1.53 per 100,000 in 1976 to 2.90 per 100,000 in 2009.

Wal-Mart stores are labeling some store-brand products to help shoppers spot healthier items. Millions of U.S. schoolchildren are helping themselves to vegetables from salad bars in their lunchrooms, while kids' meals at Olive Garden and Red Lobster restaurants automatically come with a side of fruit or vegetables and a glass of low-fat milk.

The changes put in place by the food industry are in response to the campaign against childhood obesity that Michelle Obama began waging three years ago. More changes are in store.

A study in England has strengthened evidence from Scandinavia that a vaccine used to prevent pandemic flu boosted the risk of sleep disorder among teens and children, doctors said on Tuesday.

Using the Pandemrix vaccine increased the risk of narcolepsy among people aged four to 18 by a factor of 14 compared to those who did not get the jab, they said.

The equivalent of 125,000 lethal doses of cyanide leaked from a factory in Japan after a snowplough accident, a plant operator said Wednesday.

At least five tons of liquid waste containing sodium cyanide spewed out of a tank after it was hit by a snowplough at a plating factory run by Kurosaka Plating Co. in Hanamaki, northern Japan, on Tuesday, a company official said.

The cost and health benefits of getting people not to smoke and better still, not to start, more than outweigh the taxes the tobacco industry pays to governments, the European Commission said Monday.

Irish Health Minister James Reilly, presenting the EU's new draft tobacco law in the European parliament, said smokers paid some 20 billion euros ($26.4 billion) annually in tax but health costs associated with smoking came to 23 billion euros.

Volunteer work has long been touted as good for the soul, but the practice is also good for your heart, according to a study out Monday in the journal JAMA Pediatrics.

Researchers at the University of British Columbia in Vancouver wanted to find out how volunteering might impact one's physical condition, and discovered that it improves cardiovascular health, said study author Hannah Schreier.

As baby Lili celebrates her first birthday in Australia, far away in India her surrogate mother recalls the day the child was born -- and on whom she never laid eyes.

"I averted my gaze," says Seita Thapa, recounting her experience of giving birth at the Surrogacy Center India clinic in New Delhi last February on behalf of a gay male couple who used an egg donated from another woman.

Walking with wooden crutches because polio robbed him of the use of his legs, Aminu Ahmed Tudun-Wada is determined to prevent superstition and misinformation crippling efforts to vaccinate against the disease.

"If the West wanted to kill you, it doesn't have to be through polio (immunization)," said the 53-year-old head of a polio victims' association in the Nigerian state of Kano.

Pour on the olive oil, preferably over fish and vegetables: One of the longest and most scientific tests of a Mediterranean diet suggests this style of eating can cut the chance of suffering heart-related problems, especially strokes, in older people at high risk of them.

The study lasted five years and involved about 7,500 people in Spain. Those who ate Mediterranean-style with lots of olive oil or nuts had a 30 percent lower risk of major cardiovascular problems compared to others who were told to follow a low-fat diet. Mediterranean meant lots of fruit, fish, chicken, beans, tomato sauce, salads, and wine and little baked goods and pastries.

Swiss food giant Nestle said Monday it had stopped using a Spanish supplier after tests determined there was horse DNA in products supposedly containing pure beef, in the latest development in a Europe-wide food-labeling scandal.

"Tests have shown that one batch, supplied by Servocar, a company from Casarrubios del Monte (Toledo), contains horse DNA above the one-percent threshold likely to indicate adulteration or gross negligence," Nestle said in a statement.