Table 1. Body weight gain, total food intake, fecal protein, and protein digestibility in aged SAMP8 mice.

	Control	PS23
Body weight gain (g) /mouse	0.3±0.2	0.4±1.2
Total food intake (g) /mouse	292.1±4.2	288.8±17.1
Average protein intake (g) /mouse/day	0.87±0.01	0.86±0.05
Fecal protein (g)/mouse/day#	0.15±0.01	0.08±0.01*
Protein digestibility (%)	81.23±1.7	89.81±0.91*

All values are means ± SEM (n = 6 mice/group). ^#Determined in 3 days for calculating protein digestibility. ^*Significantly different from the control group at p < 0.05 according to a two-tailed Student’s t-test.