A European Quality of Life Survey has indicated that the mental well-being of young adults in Ireland declined more rapidly after the recession than in any other EU member state.
The survey also found that the Republic's under-30s recorded one of the steepest increases in serious material deprivation.
However, they ranked first for participation in social activities and second for sport and physical exercise.
The report tracks changes in the social situation of 18 to 29-year-olds between 2007 and 2011, the period spanning the first half of the recession.
The survey found that, EU-wide, instances of deprivation increased most for young parents living in their own parents' homes.
The survey saw Ireland slip from a score of 69% to 61%, falling from sixth in this category to 23rd in the process.
Outside of Ireland no significant changes in the mental well-being of this age group was noted.
Ireland's under-30s recorded one of the steepest increases in serious material deprivation, rising from a comparatively low 7% to 18%.
This category contains people who could not afford to keep their home warm, buy meat, fish or its equivalent at least every second day and buy new, rather than second hand, clothes.
Around 1,000 people were interviewed in Ireland as part of the survey.