The primary male sex hormone or androgen, Testosterone plays a critical role in male health and development, according to scientific research. It also plays a lesser role in female development. Maintaining an adequate level of testosterone through proper diet, exercise and weight management provides a wide variety of benefits for men.

A significant increase in the production of testosterone in males triggers the onset of puberty, when the body begins to develop toward physical and sexual maturity. Testosterone allows the body to increase bone density and overall muscle mass during this period, reports It also causes the maturation of the sexual organs.

Many clinics report that the decline in testosterone production as men age contributes to the decline in libido, as well as the development of infertility. Maintaining higher levels of testosterone can help men to keep the libido active and retain the ability to perform sexually, thereby reducing the likelihood of infertility with aging. Having an active sex life also helps to boost testosterone, making one somewhat interrelated with the other. However, while not a direct effect of testosterone, the active sex life that can occur as an indirect effect of higher testosterone levels does help to prevent strokes and heart attacks, according to educational research.

Testosterone also contributes to a man's overall energy levels. Scientific research reports that up to 25 percent of men suffering with lower testosterone levels experience lethargy or feeling of tiredness. Normal levels of testosterone help to keep men feeling energetic and active. A related benefit of testosterone is that it plays a role in maintaining a regular sleep pattern, which can also improve overall energy levels.

Testosterone has been available as a pharmaceutical medication since the 1930s and has been used for many decades to treat symptoms of impaired libido and failure of secondary sexual development. With time and expanded understanding of androgen biology, it became apparent that testosterone had effects on a wide range of target organs. Deficiency of testosterone could produce a decrease in lean body mass, an increase in fat mass, a decrease in bone mineral density, impaired mood (preclinical depression), and decreased erythropoiesis, as well as a decrease in facial and body hair. Thus, the male sex hormone became a hormone of metabolic significance. Subsequent epidemiological studies also suggested that testosterone deficiency was associated with obesity and predisposes men to develop metabolic syndrome, type 2 diabetes mellitus (9, 10, 11), and increased mortality due to cardiovascular disease (12, 13).

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