Medical and surgical treatments for obesity have opposite effects on peptide YY and appetite: a prospective study controlled for weight loss

The Journal of Clinical Endocrinology and Metabolism
Juan Patricio ValderasAlberto Maiz

Abstract

The effects of medical and surgical treatments for obesity on peptide YY (PYY) levels, in patients with similar weight loss, remain unclear. The objective of the study was to assess PYY and appetite before and after Roux-en-Y gastric bypass (RYGB), sleeve gastrectomy (SG), and medical treatment (MED). This was a prospective, controlled, nonrandomized study. The study was conducted at the Departments of Nutrition and Digestive Surgery at a university hospital. PARTICIPANTS included three groups of eight patients with similar body mass indexes (RYGB 37.8 +/- 0.8, SG 35.3 +/- 0.7, and MED 39.1 +/- 1.7 kg/m(2), P = NS) and eight lean controls (body mass index 21.7 +/- 0.7 kg/m(2)). Total plasma PYY, hunger, and satiety visual analog scales in fasting and after ingestion of a standard test meal were measured. At baseline there were no differences in the area under the curve (AUC) of PYY, hunger, or satiety in obese groups. Two months after the interventions, RYGB, SG, and MED groups achieved similar weight loss (17.7 +/- 3, 14.9 +/- 2.4, 16.6 +/- 4%, respectively, P = NS). PYY AUC increased in RYGB (P < 0.001) and SG (P < 0.05) and did not change in MED. PYY levels decreased at fasting, 30 min, and 180 min after a standard test meal...Continue Reading

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