Several studies in the US and Europe demonstrat that higher intakes of omega-3 fats from fish oil are associated with a reduced risk of depressive symptoms in the postnatal period. These same studies also show improvement in the cognitive development of their offspring. Researchers are always trying to find out exactly what is responsible for these positive effects. A study reported in the October 20, 2010 issue of the Journal of the American Medical Association (JAMA) looked at whether DHA was the most important nutrient. They studied over 2400 pregnant women in Australia and followed their pregnancies and postpartum recovery. These researchers concluded that their was no difference in outcomes whether the mothers consumed DHA fish oil capsules or vegetable oil capsules that also contained omega3 fatty acids. The conclusion is that fact that pregnant mothers should be taking omega-3 fatty acids in supplementation during their pregnancy; however, it does not matter if they are fish oil capsules or vegetable oil liquid or capsules.