Raised Feeders for Saint Bernards

I read an article in a recent Saint Fancier magazine about gastric dilatation (bloat, twisted stomache, gastric torsion). The article stated that feeding in a raised bowl increased the chances of GDV(gastric dilatation/vovulus. I would like some further information as to how this increases the chances. In the past, it was recommended to use raised feeders to avoid this same thing.