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The Honest to Goodness Truth on Weight Loss
also known as vertical gastrectomy with duodenal swap, biliopancreatic diversion with duodenal swap, DS or BPD-DS) is performed by roughly 50 surgeons worldwide.
It generates weight reduction by limiting the amount of meals that can be eaten (partial gastrectomy (i.e., partial elimination of the stomach alongside the outer curvature see diagram) and by limiting the quantity of food (specifically fat) that's absorbed into the body (intestinal bypass or duodenal change).