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Understanding the Secular Decline in Testosterone: Mechanisms, Consequences, and Clinical Perspectives
Óscar Fraile-Martínez1,2, Miguel A Ortega1,2, Cielo García-Montero1,2
1Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcala, 28801 Alcala de Henares, Spain.
International Journal of Molecular Sciences
|January 28, 2026
Summary
Testosterone decline is a growing health concern linked to lifestyle factors. Addressing obesity, inactivity, and stress through lifestyle changes can help preserve hormonal health.
Area of Science:
- Endocrinology
- Men's Health
- Public Health
Background:
- Testosterone regulates key physiological functions in both males and females.
- A secular, age-independent decline in testosterone levels is observed across populations.
- This decline is linked to reduced fertility, metabolic issues, cardiovascular problems, mood disturbances, and decreased quality of life.
Purpose of the Study:
- To review the physiological significance of testosterone.
- To examine the causes and consequences of the observed decline in testosterone levels.
- To evaluate potential interventions, focusing on lifestyle and environmental strategies.
Main Methods:
- This is a narrative review synthesizing existing evidence.
- The review covers physiological roles, causes of decline, and intervention strategies.
- Emphasis is placed on lifestyle modifications and environmental factors.
Main Results:
- Aging and genetics contribute to testosterone decline, but modifiable factors play a substantial role.
- Obesity, physical inactivity, poor diet, chronic stress, inadequate sleep, and environmental toxins are key contributors.
- Lifestyle interventions (physical activity, nutrition, weight management, sleep, stress reduction, sunlight exposure) are crucial.
Conclusions:
- The contemporary decline in testosterone is a complex public health issue.
- Integrated approaches are necessary to address this multifactorial problem.
- Preserving hormonal and systemic health requires attention to lifestyle and environmental factors.
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