Abstract
Summary Background This study was carried out to investigate the effect of a single high protein breakfast on appetite related hormones (Peptide YY (PYY), and Glucagon-like Peptide-1 (GLP-1)) and perceived appetite sensation among adults. Many studies showed that dietary protein is the most satiating macronutrient, since protein may affect appetite by its involvement with appetite regulating hormones. Methods Within-subject crossover design was used, where participants received one of two assigned breakfasts on two different mornings: the first breakfast were a high protein (HP) breakfast that contained (51% protein, 13% CHO, 36% fat), while the second one had a high carbohydrates (HC) breakfast (10% protein, 60% CHO, 30% fat). Results The findings showed that PYY levels were significantly higher at (P = 0.05) significance level after the HP breakfast than the HC breakfast at 120 min. It also showed that there was an increase in postprandial GLP-1 concentration tended to be greater at significance level (P Conclusion A single HP breakfast of 51% had a greater effect on satiety rather than 10% of energy from protein, meanwhile this effect does not apply to all satiety hormones.
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