What role does SHBG play in stress?

SHBG (sex hormone-binding globulin) is a glycoprotein that binds and transports sex hormones like testosterone and estradiol. Stress, particularly chronic stress, can lower SHBG levels through several mechanisms. Elevated cortisol from the HPA axis suppresses SHBG production in the liver. Additionally, stress-induced hyperinsulinemia and inflammation also reduce SHBG. Lower SHBG leads to increased free (bioactive) sex hormones, which may influence mood, energy, and metabolic health. However, the clinical significance of stress-related SHBG changes is still debated. Some studies link low SHBG to metabolic syndrome and depression, but causality is unclear. SHBG is not a direct stress marker; it reflects long-term metabolic and hormonal balance. Evidence is moderate from human observational and mechanistic studies. No direct genetic variant for SHBG was provided in the context. Lifestyle interventions like stress reduction, exercise, and balanced nutrition may support healthy SHBG levels.