Methods for treating neurological diseases and for testing Caloric Restriction (CR) mimetics or CR mimetic candidates. In one exemplary method, a CR mimetic candidate is administered to a transgenic animal and the effects of the administering are determined; the transgenic animal includes an added gene from another type of animal or a modified gene which is designed to produce a disease or ailment of another type of animal, and the method seeks to determine whether the CR mimetic candidate improves the disease or ailment. Methods relating to neurological disease and other methods relating to CR mimetic testing are also described.