The Loop DS is an even safer form of the traditional DS, in that we bring up a loop of small intestine, rather than dividing and re-routing other sections of intestine. The Loop modification significantly reduces the risk of internal hernia (when intestine can get trapped between new connections of the small bowel), and reduces the risk of leak due to the decreased number of intestinal connections that are created. The loop DS does not carry the same risk as other loop-type procedures due to the preservation of the pylorus. The valve at the bottom of the stomach prevents the bile reflux associated with other types of loop bypasses.