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E-ISSN : 2148-9696
Crescent Journal of
Medical and Biological Sciences
Apr 2018, Vol 5, Issue 2
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Original Article
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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