Gastric Bypass Surgery How it Works
The Roux-en-Y gastric bypass, most simply known as gastric bypass, is the most popular type of weight loss surgery. 90% of patients who undergo this procedure lose over 50% of their excess body weight. After two years, total weight loss equals approximately 70% of excess body weight.
Gastric bypass uses all four surgical mechanisms in the following ways:
- Restriction is accomplished by creating a pouch approximately the size of an egg. This decreases the size of the stomach by 90%; you’ll feel full after only a few bites.
- Malabsorption occurs because a segment of the small intestine is bypassed, or skipped over. After food empties from the pouch, it is not digested and absorbed by the body until it mixes with the digestive enzymes much lower in the intestinal tract. This means your body absorbs less calories.
- Hormonal changes occur when the stomach is divided and the intestines are re-routed. This results in reduced feelings of hunger – 90% of patients report that they are “just not hungry” after the procedure. This is a lasting and very useful effect.
- Dumping syndrome is likely to occur when carbohydrate-heavy meals are consumed. Because your food enters directly into the intestines instead of being diluted and broken down in the stomach, you may experience cramping, nausea, vomiting, sweating or diarrhea when eating overly-rich meals. As a result, you likely won’t even want to eat sweets or other dishes that used to tempt you.