Brigham Young University researchers recently published a study that found that the health effects of loneliness are comparable to obesity.

Research participants who admitted to feelings of loneliness and social isolation had shorter life spans than others.

Previous research has likened the effects of loneliness to smoking 15 cigarettes a day, and drinking alcohol excessively. The current study found that a similar comparison could be made between loneliness and obesity.

"The present obesity epidemic had been predicted," the authors wrote in Perspectives on Psychological Science. "Obesity now receives constant coverage in the media and in public health policy and initiatives.

"The current status of research on the risks of loneliness and social isolation is similar to that of research on obesity three decades ago - although further research on causal pathways is needed, researchers now know both the level of risk and the social trends suggestive of even greater risk in the future."

The researchers analysed loneliness, living alone, and social isolation in studies that accounted for over 3 million participants. Variables such as socioeconomic status, preexisting conditions, age, and gender were controlled.

The study found a strong association between loneliness and early death in young populations, and loneliness and social isolation as indicators of mortality in older persons as well.

The increased likelihood of death for people reporting living alone was 32 per cent, and 29 and 26 per cent for those reporting social isolation and loneliness, respectively.

"In light of mounting evidence that social isolation and loneliness are increasing in society, it seems prudent to add social isolation and loneliness to lists of public health concerns," the authors said.

"The professional literature and public health initiatives can accord social isolation and loneliness greater recognition."