|The Association of Energy Intake and Expenditure, Macronutrients, Glycemic Index and Load, and General Characteristics with Postprandial Peptide YY 3-36 Serum Levels|
|Maryam Rahemi1, Mohmmad Alizadeh2|
|1Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
2Department of Nutrition, Food and Beverages Safety Research Center, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
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Keywords : Diet, Glycemic index, Glycemic load, Meals, Peptide YY
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Objective: This study set to determine the association between lunch dietary intakes and postprandial peptide YY 3-36 (PYY3-36) 90-120 minutes after lunch meal consumption.
Materials and methods: In the present cross-sectional study, the subjects (n=176) were asked to eat their lunch at work on the test day. One point five to 2 hours after consumption of lunch meal, postprandial concentration of PYY3-36 was measured.
Results: The subjects within the age range of 25-39 and those with ages less than 25 (p=0.005) indicated the highest and the lowest levels of PYY3-36, respectively. Postprandial PYY3-36 had a direct significant association with fat content in lunch (p=0.049) and had an inverse association with cholesterol (p=0.001), docosahexaenoic acid (DHA) (p=0.040) and eicosapentaenoic acid (EPA) (p=0.022). Moreover, polyunsaturated fatty acids (PUFAs) and linoleic acid at lunch indicated a significant positive correlation with PYY3-36 (r=0.182, p=0.016 for both). Furthermore, a significant negative correlation was detected between energy intake at dinner and post-lunch PYY3-36 (r=-0.216, p=0.004). Protein (OR=0.390, 95%CI: 0.160-0.950) and fat intake (OR=2.697, 95%CI: 1.103-6.594) at lunch, energy intake at dinner (OR=0.298, 95%CI: 0.127-0.702), and energy spent to perform physical activities after lunch (OR=0.411, 95%CI: 0.182-0.929) significantly predicted the serum concentration of post-lunch PYY3-36. No significant association was found between PYY3-36 with glycemic index and load .
Conclusions: There was a significant association between dietary intakes of lunch meal and post-lunch serum concentration of PYY3-36. Further large-scale cross-sectional researches and randomized controlled trials are needed to confirm the mentioned results.
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