Abstract
Food intake is regulated by not only neurohormonal, but also social, educational, and even cultural factors. Within the former, there is a complex interaction between orexigenic (ghrelin) and anorexigenic (glucagon-like peptide-1 (GLP-1)) factors in order to adjust the food intake to caloric expenditure; however, the number of subjects that are unable to properly balance appetite and body weight is increasing continuously. A loss of circadian or diurnal coordination of any of these factors may be implied in this situation. Special attention has retrieved GLP-1 due to its usefulness as a therapeutic agent against obesity and related alterations. Thus, the objective of the present study was to compare GLP-1 diurnal synthesis between normal weight and overweight/obese subjects, and to evaluate whether weight loss can restore the synthesis rhythms of GLP-1. Three groups of 25 subjects were divided attending to their body mass index (BMI) in normal weight, overweight, or obese subjects. Diurnal (5 points) GLP-1 levels were analyzed. Secondly, an intervention (behavioral-dietary treatment) study was conducted to analyze the effect of weight loss on plasma GLP-1 concentrations. Our results showed that baseline GLP-1 level was significantly lower in normal weight subjects (p = 0.003); furthermore, our cosinor analysis revealed a higher amplitude (p = 0.040) and daily GLP-1 variation (47 %) in these subjects. In fact, our ANOVA data showed a lack of rhythmicity in overweight/obese patients. Weight loss was not able to restore a diurnal rhythm of plasma GLP-1 levels. In summary, the present work shows a disruption of diurnal GLP-1 levels in overweight/obese subjects, which worsen as body fat progresses. The attenuation of the GLP-1 synthesis rhythms may be important to understand the impairment of food intake regulation in overweight/obese subjects.
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Abbreviations
- OCDE:
-
Organisation for Economic Co-operation and Development
- CCK:
-
Cholecystokinin
- GLP-1:
-
Glucagon-like peptide-1
- NPY:
-
Neuropeptide Y
- AgRP:
-
Agouti-related protein
- SEEDO:
-
Spanish Society for the Study of Obesity
- MetS:
-
Metabolic syndrome
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Acknowledgments
We would like to thank the psychologists Magdalena Gomez and Rosario Gomez for their assistance in the psychological and behavioral treatment of overweight and obese patients of the present study. We also want to thank Rubén Cañavate for his assistance in the language editing of the manuscript. The authors have no conflicts of interest to declare. The present work was funded by PMAFI/14/12 project, from the Support for Research Help Program of the Catholic University of Murcia.
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Muñoz, J.S.G., Rodríguez, D.J. & Morante, J.J.H. Diurnal rhythms of plasma GLP-1 levels in normal and overweight/obese subjects: lack of effect of weight loss. J Physiol Biochem 71, 17–28 (2015). https://doi.org/10.1007/s13105-014-0375-7
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DOI: https://doi.org/10.1007/s13105-014-0375-7