Therefore, increased dopaminergic neurons in the OB tissue might be related to decreased olfactory sensitivity (24). In this study, we established the streptozotocin-induced rat model of gestational diabetes, then the expression of TH and DDC in the OB tissue of male offspring of gestational diabetes (OGD) and control rats evaluated by immunofluorescence, qRT-PCR, and western blotting analysis. The gene discussed is TH; the disease is gestational diabetes.