This study, however, does not address the types of solid foods introduced, the overlap between breastfeeding and solid feeding, or potential microbial functional changes, such as mammalian target of rapamycin (mTOR), AMP-activated protein kinase (AMPK), and the insulin signaling pathway associated with obesity, that may be predicted by KEGG annotation based on shotgun analysis.116. The gene discussed is MTOR; the disease is Obesity.