The weakened sex: Why testosterone levels are declining among men worldwide
Testosterone levels among men have declined significantly over the past half-century, an international group of researchers has determined after analyzing data on more than 100,000 men from seven countries. Testosterone has long been seen as a symbol of male health, physical strength, sexuality — in short, of “masculinity.” There are several reasons for the decline, but the main one is an obesity…
A recent study examining testosterone levels in men over the past 50 years has revealed a concerning 54% decline globally, prompting alarm among experts in reproductive medicine. However, it's crucial to note that this information is based on a presentation at the European Society of Human Reproduction and Embryology (ESHRE) conference, rather than a full scientific publication.
The researchers analyzed data from 12 studies involving 102,334 men from seven countries, primarily high-income nations, which may not fully represent the situation in regions with limited long-term data. While the study found significant declines in total testosterone, free testosterone, and sex hormone-binding globulin, it cannot determine the exact causes of this trend.
The authors suggest further research is needed to understand why testosterone levels are decreasing. Testosterone, a crucial hormone for male health, plays a significant role in reproductive development, puberty, sperm production, libido, erectile function, muscle mass, bone density, fat distribution, blood cell production, metabolism, and brain function.
Testosterone levels fluctuate throughout the day, usually peaking in the morning, and can be influenced by factors such as body weight, sleep quality, physical activity, chronic diseases, medications, alcohol consumption, and stress. Among the potential contributors to declining testosterone levels, obesity stands out as a major factor.
Excess fat, particularly visceral fat, converts testosterone into estrogen, suppressing the brain's signals that trigger testosterone production in the testes. This cycle can exacerb obesity, creating a vicious cycle. Addressing obesity through a healthy diet and weight loss has been shown to normalize testosterone levels. Other factors, such as type 2 diabetes and metabolic syndrome, also negatively impact testosterone production and create a vicious cycle of insulin resistance and decreased sensitivity to insulin.
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