Second, we did not measure serum hormone levels in infants, although prior studies have demonstrated the association between hormones, such as AD, LP and ghrelin in breast milk and infant serum (Savino, Benetti, et al., 2012; Savino, Lupica, et al., 2012; Weyermann, Beermann, Brenner, & Rothenbacher, 2006). Here, GHRL is linked to Alzheimer disease.