The gastric bypass operation divides the stomach into two parts and reroutes the intestines from a straight line into a “Y” shape. Of the two upper limbs of the “Y,” one contains the food that you eat while the other houses the digestive enzymes.
The first part of the stomach, (referred to as the pouch) is approximately the size of a thumb and connects to the top part of one limb of the “Y.” The second part, (referred to as the gastric remnant) connects to the other limb of the “Y” and sits inside your abdomen continuing to make acid and digestive hormones. At the crotch of the “Y,” the two limbs come together and the food mixes with the enzymes.
This delay in mixing the food with enzymes changes the way food is broken down in your intestines and induces a very favorable change in your body’s hormonal state that triggers your brain into burning off your fat stores.