Being the breadwinner can damage men's health - but it gives women a boost.
Researchers found men's well-being declines as they take on more financial responsibility in their marriage.
Their psychological and physical health tended to be at its worst during the years in which they became their family's sole breadwinner.
But taking on more financial responsibility had the opposite effect on women, who became happier the more they contributed, while they felt psychologically worse if their spouse was contributing more than they were.
The Connecticut University study followed more than 3,000 married people aged between 18 and 32 from 1997 to 2011. Over that period, participants regularly had to answer questions on their emotional well-being and health, as well as detailing what income they had.
The researchers found that during times when men were the sole breadwinner in their family, their psychological well-being scores were an average of 5 per cent lower than in the years when their partners contributed equally.