The combined effect of inflammation and oxidative stress causes serious damage to Leydig cells. Chronic inflammation can cause dysfunction of Leydig cells, leading to lower T levels. Leydig cells, which are responsible for testosterone production, are sensitive to inflammation. Inflammation is linked to many serious health problems including heart disease, type 2 diabetes, and autoimmune diseases. Aromatization of testosterone can also contribute to enlarged breast tissue in overweight or obese men, a condition called gynecomastia. Estrogen has a negative feedback effect on testosterone. Aromatase converts androgens like testosterone into estrogens. For instance, Tribulus terrestris, a supplement commonly sold as a booster, does not appear to raise levels (29). These supplements do not contain any testosterone and are usually plant-based. All of these factors play a major role in weight loss (8, 25). It may also reduce fatigue, enhance motivation and promote greater physical activity. Over time, this cycle leads to worsening testosterone deficiency and greater fat accumulation, reinforcing the problem. This further disrupts hormone balance, slows metabolism, and increases inflammation, making it even harder for the body to produce testosterone. Excess fat tissue disrupts hormone signals from the brain (GnRH) and pituitary gland (FSH & LH), which are essential for testosterone production. Testosterone is a key hormone for men’s metabolism, muscle maintenance, and fat distribution. Low testosterone reduces lipolysis, the process in which fat is broken down for energy. Belly fat is often a mix of both hormones and habits. You want testosterone replacement therapy to give you back the energy, muscle, and drive you used to have. Most testosterone production occurs during deep sleep. However, too much high-intensity exercise without recovery may increase cortisol, so balance matters. High-intensity interval training (HIIT) may also support hormone health. One of its lesser-known roles is helping guide where the body stores fat. It is often thought of as the hormone linked to masculinity, strength, and muscle growth, but its job is much bigger than that. Testosterone is a hormone that plays many important roles in the body. Your doctor can prescribe a testosterone replacement therapy, which is the most effective way to normalize your levels. Testosterone sometimes helps men reduce visceral fat and gain muscle, but it is not the whole story. Improving sleep quality and reducing stress through small, consistent practices helps tip the balance away from visceral fat accumulation. Aerobic exercise lowers visceral fat even when total body weight barely changes. In other words, testosterone and belly fat move together in ways that matter for long term health.