'Our study shows a possible link between diet and acne. However, when we introduced symptoms of depression and anxiety in our statistical model, the role of diet became less clear,' Halvorsen said.

'On the other hand, the association between acne and mental health problems was still strong when diet was introduced. This underscores mental health problems as an important aspect of young people's acne.'

These findings were published in the open access journal BMC Public Health.