Why Men’s Testosterone Levels Are Plummeting - Dr Shanna Swan

Dr. Shanna Swan is a Professor at the Icahn School of Medicine at Mount Sinai, an environmental and reproductive epidemiologist and an author. Many of us have heard about about harmful chemicals in plastics, food and water that can mess with our hormones. But just how much truth is in this? How much of our health is disrupted by our modern environment? Expect to learn what is happening to male and female reproductive health, how important testosterone is for everyone, the problems with male fertility rates and sperm count, the chemicals that are most impacting reproductive health, what men can do to improve and increase their sperm count, how to limit your exposure to bad chemicals much more... - 00:00 What’s Happening to Men’s Testosterone Levels? 03:40 How Important is Testosterone? 09:45 Why This Negatively Affects Both Partners 17:03 Link Between Testosterone & Sperm Count 19:04 Statistics on Sperm Count Over Time 24:09 The Social Impact of Lower Fertility 33:58 Using Chemicals to Alter Hormones 42:35 How a Mother’s Food Impacts Her Baby 48:28 Lifestyle Changes to Avoid Toxicity 57:15 Effectiveness of Reverse Osmosis Filters 1:00:19 How Bad Chemicals Impact Behaviour 1:10:35 Men & Women’s Reproductive Success As They Age 1:13:28 Future of Fertility in Humanity 1:22:03 Where to Find Shanna - Get access to every episode 10 hours before YouTube by subscribing for free on Spotify - https://spoti.fi/2LSimPn or Apple Podcasts - https://apple.co/2MNqIgw Get my free Reading List of 100 life-changing books here - https://chriswillx.com/books/ Try my productivity energy drink Neutonic here - https://neutonic.com/modernwisdom - Get in touch in the comments below or head to... Instagram: https://www.instagram.com/chriswillx Twitter: https://www.twitter.com/chriswillx Email: https://chriswillx.com/contact/

Chris WilliamsonhostDr. Shanna Swanguest

Apr 10, 20241h 23mWatch on YouTube ↗

WHAT IT’S REALLY ABOUT

Hidden Chemicals, Lower Libido: Why Modern Fertility Is Collapsing Fast

Dr. Shanna Swan explains mounting evidence that male reproductive health is declining, with sperm counts falling about 1–2% per year worldwide and many signals suggesting testosterone is also under threat.
She links prenatal and lifelong exposure to endocrine-disrupting chemicals—especially phthalates and bisphenols in plastics, food, water, and personal care products—to impaired genital development, altered brain development, reduced libido, and lower fertility in both men and women.
The conversation weaves together biological, environmental, and social factors: diet, smoking, stress, contraception, changing relationship norms, and declining sexual activity all interact with chemical exposures.
Swan warns that without reducing these exposures and changing lifestyle habits, societies will become increasingly reliant on assisted reproductive technologies, deepening health and inequality problems around who can have children.

IDEAS WORTH REMEMBERING

5 ideas

Sperm counts are falling fast worldwide, and may be accelerating.

Meta-analyses of 65+ years of data show sperm counts decreasing by ~1% per year since the 1970s, rising to ~2% per year after 2000, with evidence that this is now a global phenomenon rather than confined to Western countries.

Endocrine-disrupting chemicals can de‑masculinize male development in utero.

Phthalates and other antiandrogenic chemicals, when present in pregnant women, are linked to ‘phthalate syndrome’ in male offspring—shorter anogenital distance, smaller genitals, and incomplete masculinization, mirroring decades of animal data.

These same chemicals likely reduce libido and sexual satisfaction in adults.

Phthalate exposure in both men and women is associated with lower testosterone and, in women, reduced sexual satisfaction and frequency; combined with low male testosterone, this creates a hormonal environment where fewer people are motivated to have sex.

Everyday products and packaging are major exposure sources—especially via food.

Soft plastics, food-processing tubing (e.g., milking machines), packaging, microwaving in plastic, skincare and cosmetics, and plastic water containers all leach phthalates and bisphenols into food, water, air, and through skin.

Lifestyle choices can meaningfully affect fertility alongside chemical exposure.

Mediterranean-style diets, avoiding smoking and binge drinking, maintaining healthy weight, exercising, reducing chronic stress, and improving sleep are all linked to better sperm counts and fertility outcomes in both men and women.

WORDS WORTH SAVING

5 quotes

We can’t yet say what we said with sperm count, but there are a lot of signals suggesting that testosterone is in trouble.

— Dr. Shanna Swan

Fulfilling that potential of a male‑typical genital requires testosterone at the right time and in the right amount.

— Dr. Shanna Swan

Phthalates come in, testosterone goes down… in both men and women.

— Dr. Shanna Swan

To the extent that plastics and products are taking away people’s opportunity to have a child, I believe they’ve been deprived of a basic human right.

— Dr. Shanna Swan

It’s this huge cocktail of social, hormonal, psychological, physical, environmental, lifestyle impacts that are all coalescing to neuter the human race.

— Chris Williamson

Global decline in sperm counts and possible decline in testosteroneCritical developmental windows and prenatal hormone disruptionEndocrine-disrupting chemicals (phthalates, bisphenols, micro/nanoplastics)Libido, sexual behavior, and the broader fertility crisisLifestyle factors affecting fertility (diet, smoking, stress, obesity, sleep, alcohol)Gendered brain and behavioral development influenced by hormones and chemicalsFuture of reproduction: IVF, IVG, embryo selection and social/ethical implications

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