Is a model useful in exploring the catabolic mechanisms of weight loss after gastric bypass in humans?

Henriette Kirchner, Ana Guijarro, Michael M. Meguid*

*Corresponding author for this work
11 Citations (Scopus)


PURPOSE OF REVIEW: In the USA, approximately 3% of adults are morbidly obese, in whom behavior modification and drug therapy is ineffective in inducing major weight loss. Surgery is their only reliable option. The Roux-en-Y gastric bypass accounts for 90% of all bariatric surgeries because it achieves the best weight loss results. Many studies describe weight loss and changes in metabolic blood parameters after Roux-en-Y gastric bypass. We compare recent human data with the findings in our rats to validate the versatility of using a Roux-en-Y gastric bypass rat model to explore the multifactorial molecular and physiological dimensions of weight loss and weight regain. RECENT FINDINGS: Not only mechanical factors but also changes in gastrointestinal and adipose hormones and hypothalamic neuropeptides contribute to Roux-en-Y gastric bypass induced weight loss by promoting catabolic processes. Nevertheless, the exact mechanisms of weight loss remain unknown. SUMMARY: To investigate these catabolic mechanisms we used our Roux-en-Y gastric bypass rat model in diet induced obese rats. We found clear morphometric, physiological and biochemical parallelisms between humans and our rats. It is likely that Roux-en-Y gastric bypass induces similar changes in hypothalamic neuropeptides which can only be studied using the rat model. It therefore provides a useful research tool for exploring and studying the development of adjuvant antiobesity therapies.

Original languageEnglish
JournalCurrent Opinion in Clinical Nutrition and Metabolic Care
Issue number4
Pages (from-to)463-474
Number of pages12
Publication statusPublished - 01.07.2007


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