The Dr. Hyman Show · 2026-01-28 · 77 min · 17,250 words

Why Men’s Fertility Is Collapsing and What It Means for Our Future | Dr. Michael L. Eisenberg

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Over the last half century or so, I think there's been a rise in male infertility and specifically semen quality has gotten back. Dr. Michael Eisenberg is a professor of urology and obstetrics and gynecology at Stanford University School of Medicine and the director of men's health at Stanford. He is also a board-certified urologist and leading researcher in male fertility and hormones in men's health. One of the things that came up was this idea of sperm and quality and count and all that as a

vital sign as the sixth vital sign. Interestingly, you know, where their semen quality was when they were 40 predicted their death, you know, 30, 40 years later. I'm so shocked to read that the bigger a guy's belly, the worse his sperm was. I mean if you have a fat tummy, your sperm quality and function are gonna be bad. Microplastics are getting more and more attention recently.

That's found in most testicles of men. What is happening with all these young men who have low testosterone? If you look at data age for age, the testosterone levels have gone down. More recently it is accelerating.

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