Serum peptide YY in response to short-term overfeeding in young men - PubMed (original) (raw)
Clinical Trial
doi: 10.3945/ajcn.110.003624. Epub 2011 Feb 2.
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- PMID: 21289220
- DOI: 10.3945/ajcn.110.003624
Free article
Clinical Trial
Serum peptide YY in response to short-term overfeeding in young men
Farrell Cahill et al. Am J Clin Nutr. 2011 Apr.
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Abstract
Background: Peptide YY (PYY), a gut hormone that inhibits appetite, has been linked to the development of obesity.
Objective: This study investigated the nutritional regulation of PYY after 7 d of overfeeding (70% above normal energy requirements) in normal-weight, overweight, and obese men.
Design: Sixty-nine men (aged 19-29 y) participated in the study. We analyzed the relation between fasting serum PYY before and after a 7-d overfeeding challenge in normal-weight, overweight, and obese men. In addition, we analyzed PYY with obesity-related phenotypes including weight, percentage body fat (measured by dual-energy X-ray absorptiometry), body mass index (BMI), total cholesterol, HDL, LDL, glucose, insulin, insulin resistance, and β cell function evaluated by the homeostasis model assessment of insulin resistance (HOMA-IR) and β cell function (HOMA-β) at baseline and in response to the energy surplus.
Results: Fasting serum PYY concentrations at baseline were not significantly different between the normal-weight, overweight, and obese subjects on the basis of dual-energy X-ray absorptiometry or BMI. Although the PYY concentration significantly increased due to overfeeding, no differences were observed between adiposity statuses. In addition, basal PYY was negatively correlated with the changes of total cholesterol, HDL, and LDL in normal weight. In addition, the increase in PYY after overfeeding was positively correlated with HDL cholesterol and glucose in normal-weight subjects.
Conclusions: Our findings suggest that fasting PYY concentrations are not associated with adiposity status. Moreover, the 7-d overfeeding challenge significantly increased fasting PYY, which is likely a protective response to the positive energy balance.
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