Obesity Surgery

, Volume 16, Issue 9, pp 1179–1188 | Cite as

Morbidly Obese Individuals with Impaired Fasting Glucose have a Specific Pattern of Insulin Secretion and Sensitivity: Effect of Weight Loss after Bariatric Surgery

  • Eduardo García-Fuentes
  • Jose Manuel García-Almeida
  • Juan García-Arnés
  • Jose Rivas-Marín
  • Jose Luis Gallego-Perales
  • Belén González-Jiménez
  • Isabel Cardona
  • Sara García-Serrano
  • M José Garriga
  • Montserrat Gonzalo
  • M Sol Ruiz de Adana
  • Federico Soriguer
Article

Background: Obesity is often associated with hyper-secrection of insulin. Impaired fasting glucose (IFG) has recently been redefined as a fasting plasma glucose of 5.6-6.9 mmol/L. The aim of this study was to determine whether changes in insulin secretion in morbidly obese persons also commence with normal serum glucose levels. Methods: 32 morbidly obese subjects were studied before and after bariatric surgery. Measurements were made of glucose tolerance (KG), insulin sensitivity (SI), first-phase insulin release and the disposition index (DI) from a frequently sampled intravenous glucose tolerance test. Result: In morbidly obese subjects, the SI (P<0.01), DI (P<0.01) and first-phase insulin release (P<0.02) started changing with serum glucose levels considered to be normal (5.00-5.28 mmol/L). KG showed a clear slope according to the baseline glycemia status (P<0.05), and it was significantly related with the DI, both before (r=0.76, P<0.001) and after (r=0.57, P=0.002) surgery. Following surgery, all the variables significantly associated with insulin secretion and insulin sensitivity recovered significantly. The most significant changes occurred in morbidly obese individuals with IFG. Conclusions: Morbidly obese subjects show slopes of insulin sensitivity and insulin secretion in accordance with their baseline serum glucose levels. The fall in first-phase insulin release begins when serum glucose values are considered normal. Morbidly obese persons with the IFG phenotype have a specific pattern of insulin sensitivity and insulin secretion. KG clearly discriminates the clinical phenotypes, depending on baseline serum glucose levels.

MORBID OBESITY BARIATRIC SURGERY PRE-DIABETES INSULIN RESISTANCE INSULIN SECRETION GLUCOSE TOLERANCE 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Eduardo García-Fuentes
    • Jose Manuel García-Almeida
      • Juan García-Arnés
        • Jose Rivas-Marín
          • Jose Luis Gallego-Perales
            • Belén González-Jiménez
              • Isabel Cardona
                • Sara García-Serrano
                  • M José Garriga
                    • Montserrat Gonzalo
                      • M Sol Ruiz de Adana
                        • Federico Soriguer

                          There are no affiliations available

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