IGF1 and neoplasm: Unlike caloric restriction, protein restriction results in a conserved decrease in insulin‐like growth factor (IGF)‐1 levels (Levine et al., 2014) and the activity of the IGF‐1/akt/mechanistic target of rapamycin complex 1 (mTORC1) pathway (Wei et al., 2009) leading to a decrease in tumor growth (Fontana et al., 2013).