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Does Reduced Gastric Acid Secretion in Bariatric Surgery Increase Diet-induced Thermogenesis

No Connection Between Gastric Acid Secretion and Weight Reduction or Body Composition After Bypass

Bariatric Surgery - Bariatric Research Studies

Does Reduction in Gastric Acid Secretion in Bariatric Surgery Increase Diet-induced Thermogenesis

Patients who have undergone gastrectomy for benign ulcer do not develop obesity. Furthermore, morbidly obese patients who undergo biliopancreatic diversion (BPD), Roux-en-Y gastric bypass (RYGBP) and vertical banded gastroplasty (VBG) plus truncal vagotomy, may lose more weight compared with patients who undergo VBG alone. A common characteristic of the above is the reduction of gastric hydrochloric acid secretion. We investigated whether reduction in gastric acid increases dietary-induced thermogenesis because of maldigestion of foods, and this may account for the greater weight loss in the above situations.

Method

22 volunteers without symptoms from the upper gastrointestinal tract were studied. Gastric pH was measured and resting energy expenditure (MREE), using indirect calorimetry, was determined before and 8 hours after consumption of a standard meal. Parameters were measured again after 2 months administration of proton pump inhibitors in all volunteers.

Results

Although significant reduction of gastric acid secretion occurred, following administration of proton pump inhibitors, the fasting and postprandial MREE remained unchanged.

Conclusion

The reduction in gastric acid secretion does not increase the energy requirements for digestion of foods and thus is neither the mechanism responsible for the increased weight loss observed after Roux-en-Y gastric bypass or biliopancreatic diversion, nor the explanation for the lean appearance of gastrectomized patients.

Source:
Melissas J, Kampitakis E, Schoretsanitis G, Mouzas J, Kouroumalis E, Tsiftsis DD. Department of Surgical Oncology, Heraklion University Hospital, University of Crete Medical School, Greece. 2002

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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