Testosterone is a critical hormone in men, influencing various aspects of health including muscle mass, bone density, mood, and sexual function. Understanding what can lower testosterone levels is crucial for maintaining optimal health. This article delves into the various factors that can negatively impact testosterone levels in men. 1. Aging Natural Decline with Age: Testosterone levels naturally decline with age. Starting around age 30, testosterone levels drop by about 1% per year. Reduced levels of luteinizing hormone (LH), which stimulates testosterone production, also contribute to this decline. Impact: Decreased libido, muscle mass, and bone density. Increased body fat and risk of osteoporosis. 2. Obesity Mechanism: Excess fat, particularly visceral fat, can convert testosterone into estrogen through the enzyme aromatase. Insulin resistance, often associated with obesity, can impair the production of gonadotropin-releasing hormone (GnRH), which is essential for test