Table 1.

Correlations between gut hormones, energy intake, and gastric emptying.

	Energy Intake		Gastric Emptying (T50)
	r	p	r	p
Glucose	0.05	0.68	−0.14	0.28
Insulin	−0.41	0.001	0.80	<0.001
Glucagon	−0.34	0.005	0.81	<0.001
Ghrelin	0.36	0.003	−0.53	<0.001
CCK	−0.33	0.008	0.77	<0.001
GIP	−0.32	0.008	0.75	<0.001
GLP-1	−0.31	0.011	0.68	<0.001

r and p values of within-subject correlations between energy intake (0 g (control, ~2 kcal), 30 g (120 kcal) and 70 g (280 kcal) whey protein intake: younger n = 16: 1082 ± 106 kcal, 963 ± 79 kcal, 948 ± 82 kcal; older n = 16: 843 ± 77 kcal, 803 ± 75 kcal, 793 ± 78 kcal), gastric empting half time (T50; control, 30 and 70 g whey protein intake: younger n = 16: 16 ± 1 min, 32 ± 3 min, 85 ± 10 min; older n = 15: 23 ± 2 min, 65 ± 7 min, 130 ± 10 min) and blood glucose (mmol/L), plasma insulin (mU/L), glucagon (pg/mL), ghrelin (pg/mL), CCK (pmol/L), GIP (pmol/L), and GLP-1 (pmol/L) concentrations (AUC 0–180 min) in healthy older and younger adults. Within-subject correlations were determined by using a general linear model with fixed slope and random intercept.