"It is difficult to demonstrate that screening for gestational 
diabetes during pregnancy and treating women as appropriate improves 
pregnancy outcomes," says Jeffrey L. Ecker, MD, Assistant Professor of 
Obstetrics, Gynecology, and Reproductive Study at the Massachusetts General 
Hospital and Harvard Medical School in Boston, Mass. "It's especially 
difficult to demonstrate that treatment decreases the rate of Caesarean 
sections and birth trauma."