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Effects of 1 and 3 g cinnamon on gastric emptying, satiety, and postprandial blood glucose, insulin, glucose-dependent insulinotropic polypeptide, glucagon-like peptide-1, and ghrelin concentrations in healthy subjects. Hlebowicz J, Hlebowicz A, Lindstedt S, Björgell O, Höglund P, Holst JJ, Darwiche G, Almér LO. Am J Clin Nutr. 2009 Jan 21. [Epub ahead of print] PMID: 19158209 doi:10.3945/ajcn.2008.26807

As we noted in this article back in July, there are several hormones and neurotransmitters that have noteworthy effects on appetite and eating behavior, and as a result are of much interest with respect to weight gain (or loss) and obesity. The two mentioned in that article were NPY and PYY. The protein leptin is another hormone of this sort. It is often discussed in connection with obesity, because it is believed to increase metabolism and decrease appetite (as a signal of satiety). Another hormone, ghrelin, is produced in the stomach as a signal of hunger, and so it increases appetite.