The laparoscopic Roux-en-Y gastric bypass leads to weight loss through two mechanisms: restriction and malabsorption.
The gold standard in weight loss surgery: Roux-en-Y gastric bypass
It’s important to note that malabsorption simply means that consumed calories will have less of an impact. Malnutrition, on the other hand, is produced by bypassing too much of the small intestine. This operation is considered the gold standard for weight loss surgery given its length of existence and extensive use since 1967.