This study examined whether a high protein intake (PI) from either milk or meat could increase IGF-I and IGF-I/IGFBP-3 in healthy, prepubertal children. IGF-I levels are positively associated with growth velocity in children.  The study found that high intake of milk and not meat, increased concentrations of IGF-I and IGF-I/IGFBP-3 significantly. The conclusion is that compounds in milk and not a high PI as such seem to stimulate IGF-I.