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Polyphenol-rich curry made with mixed spices and vegetables increases postprandial plasma GLP-1 concentration in a dose-dependent manner


Glucagon-like peptide-1 (GLP-1) plays an important role in glucose homeostasis. Evidence is emerging that dietary bioactive phytochemicals such as polyphenols can increase GLP-1 concentration in vivo. Spices are rich in polyphenols and have oro-sensory properties, both of which can increase GLP-1 secretion. We therefore investigated the effects of mixed spices intake on postprandial GLP-1 concentration. Using a randomised, controlled, dose-response crossover trial in 20 young, healthy, Chinese men, volunteers were served white rice with 3 doses of curry made with mixed spices and vegetables. These test meals were isocaloric and macronutrient matched. Plasma total GLP-1 concentrations were measured before (baseline) and for up to 3 h after the consumption of test meals. We found a significant dose dependent increase in total AUC of plasma GLP-1 concentrations, adjusted for baseline, with increasing mixed spice doses [adjusted mean (±SEM) of 10568.3 ± 1267.9, 12391.8 ± 1333.94, and 13905.1 ± 1267.6 pg ml−1.min for Dose 0 Control, Dose 1 Curry and Dose 2 Curry respectively (p = 0.019)]. Consumption of polyphenol rich mixed spices and vegetables can therefore increase in vivo GLP-1 concentration.

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This project was funded by the Singapore Institute for Clinical Sciences, Agency for Science Technology and Research (A*STAR), Singapore. The authors would like to thank Shalini D/O Ponnalagu for her help with statistical analysis, Susanna Lim for her assistance with phlebotomy and the volunteers for taking part in this study.

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Correspondence to Christiani Jeyakumar Henry.

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Haldar, S., Chia, S.C. & Henry, C.J. Polyphenol-rich curry made with mixed spices and vegetables increases postprandial plasma GLP-1 concentration in a dose-dependent manner. Eur J Clin Nutr 72, 297–300 (2018).

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