A new study suggests using certain types of anti-depressants during pregnancy may lead to problems with the baby.

Researchers in Denmark looked at data from more than 55,000 women who gave birth between 1989 and 2006.  They found women who took SSRIs to treat depression during pregnancy on average gave birth about five days earlier and had babies who spent time in the neo-natal intensive care unit.

But experts say there is also a risk when depression is left untreated during pregnancy, as those women may be more likely to forego prenatal care.

The study was led by researchers at Aarhus University in Denmark and published in the October 2009 issue of the Archives of Pediatrics & Adolescent Medicine, one of the JAMA/Archives journals.

The right diet may help prevent depression in some people.  Spanish researchers followed more than 10,000 people over four years.  They found that people who stick to a Mediterranean diet that emphasizes fruit, nuts, whole grain and fish were least likely to develop depression over the four year study period.

They think the combination of omega-three fatty acids, flavonoids, anti-oxidants and other beneficial components of the diet is key.

The study was led by researchers at the University of Las Palmas de Gran Canaria and Clinic of the University of Navarra, Pamplona, Spain.  It's published in the October 2009 issue of the Archives of General Psychiatry, one of the JAMA/Archives journals.