Illegal online pharmacies are using social media to attract young customers and sell them illicit drugs and medicines, a U.N. agency warned Tuesday.

"Illegal Internet pharmacies have started to use social media to get customers for their websites," Hamid Ghodse, president of the International Narcotics Control Board, said in the agency's annual report published Tuesday.

The U.S. Food and Drug Administration announced Tuesday it will revise warnings posted on the cholesterol-fighting drugs called statins because of a slightly increased risk of diabetes.

Elevated blood sugar levels have been reported in patients using statins, the FDA said.

Hundreds of thousands of people have been fitted with replacement hips whose flawed design may be exposing them to toxic metal, according to a probe by the BBC and the British Medical Journal (BMJ) unveiled Tuesday.

The risk comes from "metal on metal" joints that grind against each other, with the risk of leaking cobalt and chromium into the body, it said.

A 27-year-old Turkish man who underwent the world's first would-be quadruple limb transplant died Monday, hours after the limbs were removed due to metabolic failure, the hospital said.

Hacettepe University said doctors had to remove two arms and two legs that were transplanted on Sevket Cavdar Friday night because of a serious metabolic disorder and tissue incompatibility.

Commonly-prescribed sleeping pills are linked to a more-than fourfold risk of premature death, according to an American study published in the journal BMJ Open on Monday.

These medications were also associated at higher doses with a 35-percent increased risk of cancer as compared with non-users, but the reason for this is unclear.

Early diagnosis is considered key for autism, but minority children tend to be diagnosed later than white children. Some new work is beginning to try to uncover why — and to raise awareness of the warning signs so more parents know they can seek help even for a toddler.

"The biggest thing I want parents to know is we can do something about it to help your child," says Dr. Rebecca Landa, autism director at Baltimore's Kennedy Krieger Institute, who is exploring the barriers that different populations face in getting that help.

A new strain of influenza A has been found in fruit bats, indicating for the first time that bats, like birds, can be carriers of the virus, though it is not believed risky to humans, U.S. health authorities said Monday.

"This is the first time an influenza virus has been identified in bats, but in its current form the virus is not a human health issue," said Suxiang Tong, head of the Centers for Disease Control and Prevention's pathogen discovery program.

The Taliban claimed Monday it was behind the poisoning of coalition troops' food in eastern Afghanistan as NATO launched an investigation after "traces of bleach" were found in fruit and coffee.

The investigation was opened after lab tests discovered the traces in the food at a base run by the NATO-led International Security Assistance Force (ISAF) in Nangarhar province, an ISAF spokesman told Agence France Presse.

Turkish surgeons had to remove one leg from a patient who underwent a quadruple limb transplant after his heart and vascular system failed to sustain the limb, the hospital said on Sunday.

Fifty-two doctors from Ankara's Hacettepe University Hospital performed what was reported as the world's first-ever quadruple limb transplant on Friday, attaching two arms and two legs to Sevket Cavdar.

An experiment that produced human eggs from stem cells could one day be a boon for women who are desperate to have a baby, according to a study published on Sunday.

The work sweeps away the belief that a woman has only a limited stock of eggs and replaces it with the theory that the supply is continuously replenished from precursor cells in the ovary, its authors said.