Washington, Apr 4: Sports drinks may boost your performance on the pitch, but they won''t repeat the act for your sparkling smile, say scientists.

NYU dental researchers have found that the energy-boosting beverages expose people to levels of acid that can cause tooth erosion and hypersensitivity.

A recent study had revealed that prolonged consumption of sports drinks may be linked to a condition known as erosive tooth wear, in which acids eat away the tooth''s smooth hard enamel coating and trickle into the bonelike material underneath, causing the tooth to soften and weaken.

Washington, Apr 4: Older men who were big during their 20s are at an increased risk of suffering from atrial fibrillation, or abnormal heart rhythm, says a new study.

According to the new research from the Sahlgrenska Academy, University of Gothenburg, Sweden, being big includes height and weight.

The study, which has been published in the latest issue of the European Heart Journal, was initiated in 1970.

Washington, April 4: University of Florida researchers say that it is possible to predict a person’s risk of contracting sexually transmitted diseases (STDs) by looking at his/her partner’s behaviour.

The researchers have even charted five specific characteristics that can help gauge how risky certain partners are.

The characteristics include whether the partner has a problem with marijuana or alcohol, was at least five years older or younger, had been in jail, had sex with other people in the past year, or had an STD in the past year.

Washington, Apr 3 : A special region of the brain''''s visual cortex, which is in charge of distinguishing between background and foreground images, called V2, is what makes brain cells remember things, according to a new study.

Neuroscientists at The Johns Hopkins University have demonstrated that nerve cells in V2 can "grab onto" figure-ground information from visual images for several seconds, even after the images themselves are removed from our sight.

Washington, Apr 3 : Preschoolers who snore are at an increased risk of developing mood disorders, and are likely to have language and attention problems, say researchers.

"The results of our study bring out snoring as a possible risk factor for mood problems and cognitive impairment in children," said lead researcher Eeva T. Aronen, M. D., Ph. D., of Helsinki University Central Hospital, Helsinki, Finland.

During the study, the researchers looked at 43 preschoolers aged five, who snored and 46 children who did not snore.