Myths vs facts: Testosteron and weight loss

Testosterone is often marketed as a weight-loss booster, but the evidence is nuanced. Fact: Low testosterone correlates with higher body fat and lower muscle mass. Weight loss—especially through diet and exercise—can naturally raise testosterone in overweight men. Myth: Testosterone replacement therapy (TRT) alone causes significant, sustained weight loss. Randomized controlled trials show modest improvements in body composition (more lean mass, less fat), but total weight loss is typically small (2–5 kg) and inferior to lifestyle changes. Moreover, TRT carries risks: cardiovascular events, sleep apnea, and prostate issues. It is not a weight-loss drug. TRT is only indicated for clinically confirmed hypogonadism and must be medically supervised. For eugonadal men, exogenous testosterone does not enhance weight loss and may suppress natural production. Evidence grade: human-moderate (RCTs on body composition, but no long-term weight-loss primary endpoint data).