The research team looked at data from approximately 90,000 pregnancies that occurred between 1996 and 2002 and were tracked by a national registry in Denmark. They focused on modifiable risk factors including exercise, alcohol consumption, smoking, drinking coffee, work schedule, regular heavy lifting, prepregnancy weight, and maternal age, and concluded that by lowering these risk factors, more than 25 percent of miscarriages could be prevented.
The prepregnancy factors they found that were most associated with lowering miscarriage risk were weight and age. Women who had a healthy body mass index (BMI) and were between 25 and 29 years old at the time of conception had a more than 14 percent lower risk of miscarriage. According to the data, the overall highest risk factors associated with miscarriage were drinking alcohol during pregnancy and a maternal age of 30 or over.
Critics of the study point out that “risk is not the same as cause.” However they agree that miscarriages should be a topic for prevention. See more about the study at: http://shine.yahoo.com/parenting/researchers-25-percent-miscarriages-preventable-192300319.html.