Cell signaling is at the core of most biological processes from the simplest to the most complex. In addition to unicellular organisms possessing the essential ability to receive inputs with regard to nutrient availability and noxious stimuli, the cells in multicellular organisms require signaling from adjacent, as well as distant cells to maintain normal internal function, including growth, differentiation, and homeostasis. Conversely, the etiology of many disease processes, such as those involving immune system dysfunction and tumor development, have been traced to aberrant cell signaling. Nutrients and Cell Signaling, in presenting contributions from a wide array of experts in the field, fully delineates the role of nutrients in cell signaling. The text emphasizes broad concepts and covers all major groups of nutrients. Contributors discuss the role of carbohydrates, amino acids, lipids, vitamins, minerals, and trace elements in essential processes such as cell proliferation, immune function, and DNA repair. The editors have organized the work to provide select examples organized under these contemporary research areas: