As we have recently reviewed [97], GLP-1 mimetics routinely prescribed for T2DM have been reported to improve experimental models of AD (reversed memory impairment and synaptic loss) [98], PD (preserved dopaminergic neurons) [99], TBI (reversed behavioral impairment and memory deficits) [100,101], and stroke (reduced brain damage and improved functional outcome) [99,102]. The gene discussed is GCG; the disease is Alzheimer disease.