Several intervention trials have been performed to minimize GWG
in obese women, because obesity and excessive GWG have been associated with
negative pregnancy outcomes [19,20]. Currently, there is only
one GWG recommendation for obese women; little is known about
the appropriate GWG for women in obesity classes II and III and the consequences
of inadequate GWG [21]. In the present study,women in obesity
classes II and III gave birth to heavier neonates than did non-obese
women, even when following the IOM GWG recommendations. Therefore,
separate GWG recommendations according to obesity class are
needed. The present results indicate that women in obesity classes II
and III should probably gain less than is currently recommended by
the IOM.