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How Weight Loss Surgery Works to Reduce Morbid, Malignant Obesity

Gastric band restricts food intake, bypass limits calorie absorption
Weight Loss Surgery Information

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How Weight Loss Surgery Works

Figure 1. The Normal Food Digestion System

After chewing, food passes through the esophagus to the stomach, whose stomach acids break it into smaller particles. It then passes into the small intestine where it's nutrients are ingested. First, in the duodenum, calcium, iron and a few vitamins are absorbed. Next, in the jejumum and ileum, the remaining (majority) of food nutrients and calories are absorbed. The indigestible food remnants (mainly fiber) continue through to the large intestine and are duly excreted.

Smaller Appetite and Fewer Calories

Weight loss surgery works by reducing appetite and calorie-intake. During gastric surgery, the stomach-size is greatly reduced. This reduces appetite significantly. Also, in some stomach surgery procedures, part of the small intestine is "bypassed" to reduce the number of calories (and nutrients) that can be absorbed.

Gastric Banding or Gastric Stapling Surgery

This kind of "restrictive" bariatric surgery uses a gastric band/ring or staples to reduce stomach size. It makes no attempt to alter the anatomy of the digestive tract by (eg) bypassing the small intestine. This kind of bariatric procedure produces less weight loss.

Gastric or Stomach Bypass

This type of weight loss surgical operation shrinks the size of the stomach AND bypasses some (or most) of the early section of the small intestine (duodenum). The bypass causes less food (therefore calories and nutrients) to be absorbed. Hence these operations are called "malabsorptive". This kind of bariatric procedure produces greater weight loss.

Post-Operative Patient Compliance Essential

Neither restrictive nor malabsorptive procedures can be successful unless patients follow the dietary and exercise guidelines issued to them by their surgeon.

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Bariatric Surgery

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BARIATRIC & GASTRIC SURGERY INFORMATION

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Laparoscopic or open bariatric surgery, such as gastric banding or bypass is not an easy solution to morbid obesity and weight loss. It is a serious surgical procedure, involving health risks. To produce lasting weight loss it requires a long-term patient commitment to eating a healthy diet and following a regular program of physical exercise. Life-long use of nutritional supplements may also be necessary. So, before deciding, discuss your options fully with your doctor. © 2003-2017 Bariatric-Surgery.Info - Terms - Contact - Information - Resources