Drinking the caffeine equivalent of more than four espressos a day is harmful to health, especially for minors and pregnant women, the EU's EFSA food safety agency said on Wednesday.

"It is the first time that the risks from caffeine from all dietary sources have been assessed at EU level," the agency said in a statement, recommending that an adult's daily caffeine intake remain below 400 milligrams a day.

A man in need of a kidney donor is taking his search on the road in unusual fashion, with bright yellow letters taped to the rear window of his SUV.

The message on Neal Raisman's silver-blue vehicle reads: "Got kidney? I need 1." It includes a phone number for interested callers.

A genetically modified herpes virus was effective in fighting skin cancer by infecting and destroying cancer cells as well as triggering an immune response, according to results of a clinical trial released Tuesday.

It was the first time an advanced-stage trial of this type of drug has shown such positive results, according to scientists from The Institute of Cancer Research in London who published their study in the American Journal of Clinical Oncology.

A cholera outbreak raging among Burundian refugees in Tanzania has slowed significantly with no new deaths reported in the past five days, the United Nations said Tuesday.

So far, around 30 people have died and more than 4,400 people have been infected with cholera in the western Tanzania's Lake Tanganyika area, which has been flooded with people fleeing political unrest in neighboring Burundi, the U.N. refugee agency said.

Methamphetamine seizures across much of the Asia-Pacific region have quadrupled over five years, the U.N. said Tuesday, citing rising wealth as one reason for a boom in production and consumption.

Growing economic integration across the region was also enabling cross-border criminal networks to cooperate in peddling amphetamine-type stimulants and so-called "legal highs", the United Nations Office on Drugs and Crime (UNODC) said in a report.

Australia's Treasurer Joe Hockey will reconsider what has been dubbed the "tampon tax" after a campaign by a university student rallied nearly 100,000 supporters in branding the levy sexist.

When Australia introduced a Goods and Services Tax (GST) in 2000, health products such as condoms and sunscreen were exempt from the 10 percent charge, along with most foods.

Sticky plaque gets the most attention, but now healthy seniors at risk of Alzheimer's are letting scientists peek into their brains to see if another culprit is lurking.

No one knows what actually causes Alzheimer's, but the suspects are its two hallmarks — the gunky amyloid in those brain plaques or tangles of a protein named tau that clog dying brain cells. New imaging can spot those tangles in living brains, providing a chance to finally better understand what triggers dementia.

Teenagers who are very overweight may run double the risk of developing colorectal cancer when they reach middle age, according to research published Monday.

Researchers tracked the health of more than 239,000 men who had been conscripted into the Swedish army between the ages of 16 and 20 from 1969 to 1976.

Itchy eyes, sneezing and wheezing are likely to spread in Europe in coming decades as a notorious allergy-causing North American weed goes on the rampage, scientists said on Monday.

Introduced to Europe in the late 19th century, common ragweed (Ambrosia artemisiifolia) is a plant with reddish stalks whose tassel flowers are massive producers of pollen.

China on Monday executed a man who stabbed a doctor to death over what he considered a botched nose operation, media reported, in a case that spotlighted the country's overburdened health system.

Lian Enqing was sentenced to death last year for a fatal attack on an an ear, nose and throat specialist in Wenling, in the eastern province of Zhejiang.