Long-term, committed relationships have significant benefits on an individual's mental and physical health, according to a study from researchers at Cardiff University.

On average, people who are married tend to live longer. Female spouses often have better mental well-being, while males tend to be physically healthier. The research team suggests that being married has a positive influence on men's lifestyle, and that the security of being in a serious relationship imparts a mental and emotional boost for women.

However, the team points out that there is evidence to the contrary, and that some studies have shown single people to have better mental health. This may be due to the stress, anxiety and depression that may occur during the break-up of a relationship or marriage.

"Exiting a relationship is distressing," the researchers explained, and added that those with multiple romantic partners may have a higher risk of early death.

They also pointed out that intimate relationships during adolescence have been linked to depressive symptoms.

Troubled teens who have relationship difficulties could benefit from attending a therapeutic boarding school, which may help them learn how to better cope with their struggles.