U.S. researchers warned Tuesday of an alarming link between vitamin E supplements and a 17 percent increased risk of prostate cancer, describing the findings as an "important public health concern."

Ten years after the start of a randomized trial of more than 35,000 men, researchers discovered the spike in prostate cancer among those assigned to take vitamin E rather than selenium or a placebo.

The percentage of Americans who are overweight or obese fell slightly in the third quarter of this year, but they still make up a majority of the population, a Gallup poll showed Friday.

Some 36.6 percent were a normal weight, up a percentage point from a year earlier, while 35.8 percent were overweight, down from 36.0 percent, and 25.8 percent were obese, down from 26.6 percent.

Routine screening for prostate cancer does not help save the lives of healthy men and often triggers the need for more tests and treatments, a U.S. government health panel said Friday.

The U.S. Preventive Services Task Force's draft recommendations, which will be open to public comment on Tuesday, are likely to face a pushback from advocates of the PSA blood test, as well as from drugmakers and doctors who benefit from the now-lucrative screening industry.

Lung damage caused by smoking could cause an additional 18 million cases of tuberculosis and 40 million extra deaths from TB by 2050, according to a study published on Tuesday in the British Medical Journal (BMJ).

The estimates derive from a mathematic model of smoking trends and smoking's impact on TB risk.

Brazil on Tuesday approved the use of an anti-obesity medication, sibutramine, which has been banned in Europe and the United States, officials said.

The National Health Surveillance Agency (Anvisa) said it would halt sales of weight-loss medications which are based on amphetamines, but allow sibutramine under heightened surveillance.

Eighteen people have died and 100 people have fallen ill since late July in the United States from eating cantaloupes infected with listeria, health authorities said Tuesday.

Illnesses have been reported in 20 states due to the cantaloupes which came from the Colorado-based Jensen Farms, the Centers for Disease Control and Prevention said in its latest update.

The number of young people having unprotected sex in the West has risen sharply over the past two years, a survey said Monday, with health professionals concerned the safe sex message is falling on deaf ears.

The study by the Parenthood Foundation showed particularly sharp increases among sexually active teenagers in the United States and in European countries such as France who were failing to use contraception with a new partner.

Lying on a hospital bed in her laced violet nightgown, Derya Sert is the first woman in the world to receive a womb from a deceased donor, raising hopes for millions of women to bear a child.

Doctors at Akdeniz University Hospital in Turkey's southern province of Antalya successfully transplanted a womb on August 9 to Sert, 21, who was born without a uterus, like one in every 5,000 women around the world.

A rare virus has killed three people and sickened nearly 100 in Japan, the Philippines, the United States and the Netherlands over the past two years, U.S. health authorities said Friday.

The culprit is human enterovirus 68 (HEV68), and its respiratory symptoms can be particularly dangerous to children, the U.S. Centers for Disease Control and Prevention said in its Morbidity and Mortality Weekly Report.

Canada's top court on Friday ordered the federal health minister to allow North America's first government-sanctioned drug injection facility in Vancouver's seamy Downtown Eastside to remain open.

The InSite clinic in one of Canada's poorest neighborhoods is the only place on the continent where addicts can receive medical supervision as they inject heroin illegally bought on the street.