OXT and obesity due to melanocortin 4 receptor deficiency: Collectively, these results suggest that OXT, an essential regulator of the gut-brain axis (Olszewski et al., 2017) also exercising key roles in various other neurobehavioral pathways and homeostatic systems (McCormack et al., 2020), might be a biomarker and even a potential target of intervention worthy of further study in the management of both PTSD and obesity.