Modern Wisdom #769 - Dr Shanna Swan - Why Are Men’s Testosterone Levels Plummeting?
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Apr 11, 2024 
Dr. Shanna Swan, a Professor at the Icahn School of Medicine and renowned environmental and reproductive epidemiologist, discusses the alarming decline in testosterone levels and its wide-ranging implications for reproductive health. She explores how endocrine disruptors like phthalates affect fertility and what men can do to improve sperm count. The conversation delves into the global decline of sperm counts, societal pressures, and practical tips to minimize chemical exposure. Listeners will gain insights into the connection between modern lifestyles and hormonal health.
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Declining Testosterone Levels
- Testosterone levels in men may be declining, but research is ongoing.
- Clinical data shows alarming increases in testosterone use, especially among young men.
Testosterone's Role in Fetal Development
- Testosterone plays a critical role in fetal development, particularly in the first trimester, differentiating male genitals.
- Insufficient testosterone during this period can lead to incomplete masculinization.
Phthalates and Libido
- Phthalates, chemicals making plastic soft, lower testosterone in both men and women.
- Higher phthalate levels in women correlate with lower sexual satisfaction and frequency.
