Cologne, Germany - Teenagers commonly experience mood swings and are not always approachable, and this behaviour can make it hard for parents to differentiate such emotional fluctuations from genuine depression.

Experts say it's important for parents to monitor their teenager's moods and seek treatment when warranted.

Washington, Nov 2 : Being unemployed can have long-term and possibly permanent psychological effects, including low self esteem, depression and anxiety, on an individual, according to a new study.

The research team led by Arthur H. Goldsmith, the Jackson T. Stephens Professor of Economics at Washington and Lee University said that as the period of unemployment increases the effects often become chronic.

“In the first phase of unemployment, people have a benign ignorance and think it will turn out fine, that they are not going to be emotionally damaged by this, because they’ll just go out and get a job,” said Goldsmith.

Washington, Nov 2 : Frequent urination at night can help protect against bladder cancer, says a new study.

A team of Spanish and American scientists suggests direct association between the number of times people get up at night to urinate and protection against bladder cancer.

Juan Alguacil, a researcher from the University of Huelva and one of the authors, suggest that night-time is usually the period during which there is the longest time interval between urination.

“The length of time carcinogenic agents, such as those from tobacco for example, are present in the urine, constitutes an important factor towards the likelihood of developing bladder cancer,” Science Daily quoted Alguacil as saying.

Coffee can help stay one alert for long hours. A team of Swimburne University of Techology (SUT) carried out the study by a new optical instrument.

Patterson said, “In our project we used the Australian-designed Optalert, which measures drowsiness by observing total duration of eye blinks and the ratio of amplitude and velocity of eye closure during blinking.”

London, Nov 2 : Want to get rid of those extra pounds? Well, then all you need to do is simply write down your daily food intake, for it can double your weight loss, according to a new study.

The study, from the University of Wisconsin-Madison, followed 1,700 overweight people over six months, and revealed that those who wrote down everything they ate lost an average of 13lb.

London, Nov 2 : An hour''''s lie-in on Monday mornings can help cut the risk of having a heart attack, suggests a new study.

According to boffins, Mondays are a peak time for heart attacks due to the stress of the morning commute, the first workday of the week and fatigue from the weekend.

To reach the conclusion, the research team examined the number of heart attacks suffered in the week after the Spring and Autumn clock changes, compared to the same days of the week at other times.

After analysing, the research team found that the number of heart attacks increased in the days after the clocks went back in the Spring and decreased slightly on the Monday following the Autumn change when the clocks go forward by an hour.