Duodenal Transit Bipartition (DTB) has emerged as a surgical concept designed to enhance metabolic outcomes while preserving gastrointestinal physiology. Unlike traditional bariatric procedures that rely primarily on restriction or malabsorption, DTB focuses on early stimulation of the distal intestine.

This concept is central to modern metabolic surgery.

Distal Intestinal Hormonal Response

The distal ileum contains a high density of enteroendocrine cells that release hormones including:

GLP-1
PYY
oxyntomodulin

When nutrients reach the ileum earlier than normal, these hormones are secreted in higher concentrations.

This phenomenon is known as the incretin effect.

Clinical Implications

The early arrival of nutrients to the distal intestine contributes to:

improved insulin secretion
reduced appetite
improved glycemic control

These metabolic changes are fundamental in the treatment of obesity and type 2 diabetes.

A detailed overview of the surgical evolution of this concept is presented in the pillar article on Duodenal Transit Bipartition and metabolic surgery.