Wael Demian from the Rotin lab at Sickkids, recently published a Cell Reports paper showing that the ion transporter NKCC1, known to regulate cell volume, forms a complex with the leucine transporter LAT1 and the Gln transporter ASCT2, and regulates mTORC1 activation via LAT1 and growth factors signaling. Thus, the work of Demian, et al. provides a long-sought link between cell size and cell mass.