This procedure aims to achieve a permanent weight loss with mean final weight approaching 30% excess weight.

This final weight depends largely on the initial excess weight. In extremely obese patients with > 120 % excess weight, the final weight can be 40% excess weight.

With an initial excess weight below 100 % the final weight may even be less than 20% excess weight.

In addition to weight loss, BPD is responsible for several other beneficial results.
These are presented in the following table from an article by Scopinaro.
Patients were only considered to be “cured” when the beneficial effects were maintained in all further investigations.