Many neurological diseases, such as Alzheimer’s disease (AD), Parkinson’s disease (PD), epilepsy, bipolar disorder (BD), schizophrenia (SZ), and major depressive disorder (MDD) are characterized by cerebral glucose hypometabolism, insulin resistance, neurotransmitter imbalances, mitochondrial dysfunction, oxidative stress, and inflammation as potential causative factors [5,6]. The gene discussed is INS; the disease is Parkinson disease.