Children who spend too much time watching television increase the risk of heart disease, high blood pressure and diabetes in later life, an Australian study showed Wednesday.

In what was declared world-first research, the University of Sydney found that six- to seven-year-olds who spent the most time watching television had narrower arteries in the back of their eyes.

U.S. researchers have recreated the process by which ovarian cancer forms in the lab, providing solid evidence that the tumors start in the fallopian tubes, not the ovaries, a study said Monday.

The finding could provide clues on how to attack ovarian cancer, which often causes no early symptoms and by the time it is found has spread so much that the tumors are impossible to stop.

An expectant mother's diet during pregnancy can alter her baby's DNA in the womb, increasing its risk of obesity, heart disease and diabetes in later life, an international study has found.

Researchers said the study provided the first scientific evidence linking pregnant women's diet to childhood obesity, with major implications for public health.

Russian President Dmitry Medvedev on Monday called for drug testing in schools, warning that narcotics abuse was now such a major problem that it was weighing down the economy.

Speaking at a government meeting in the Siberian city of Irkutsk, identified by officials as a particular trouble spot for abuse, Medvedev said that no fewer than 2.5 million Russians were drug addicts.

Indian housewife Sujata Budarapu was shocked when she was told that her two sons were on the verge of developing Type 2 diabetes.

"It had never even occurred to me that this could happen. I had heard that outside India this happens to other people's kids but I never thought it would happen to my own," the 38-year-old from Mumbai told Agence France Presse.

People with Alzheimer's disease may start experiencing shrinking of parts of the brain as many as 10 years before the degenerative condition is diagnosed, a U.S. study suggested on Wednesday.

While the results are still preliminary, scientists said the findings could one day provide a way to identify by MRI scan which individuals are most likely to develop the disease, which can run in families and has no cure.

Genital herpes can be transmitted even if a person has no symptoms, suggesting a high risk of transmission from people with unrecognized infections of herpes simplex 2, researchers said on Tuesday.

The study published in the Journal of the American Medical Association followed about 500 people between March 1992 and April 2008. The subjects took daily swabs of their genital secretions for 30 to 60 days.

It's that time of year when the bugs emerge to bug us.

Some can pose real threats — Lyme disease from tiny ticks, West Nile virus from mosquitoes, or life-threatening allergic reactions to bee stings. But most bug bites in this country are an itchy nuisance.

Japan prepared on Tuesday to undertake its first organ transplant from the body of a child aged under 15, made possible by a legal amendment aiming to save the lives of many children.

The health ministry said that the child, identified only as a boy aged between 10 and 15, was declared brain-dead early on Tuesday after suffering serious head injuries in a traffic accident.

A new treatment for obesity that combines two existing drugs resulted in twice as much weight loss as the only approved long-term anti-obesity medication, according to a study released Monday.

A mix of Phentermine and topiramate, sold under the brand name of Topamax, was shown in clinical trials to be twice as effective as orlistat, which is commercialized in some countries as Xenical or Alli, it said.