Dr. Shanna Swan: Dissecting the Fertility Crisis

Описание к видео Dr. Shanna Swan: Dissecting the Fertility Crisis

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My guest today is Dr. Shanna Swan, a distinguished PhD environmental and reproductive epidemiologist. Dr. Swan is a Professor of Environmental Medicine and Public Health at the Icahn School of Medicine at Mount Sinai in New York City, and adjunct faculty at UCSF. She is world renowned for her groundbreaking research on the impact of environmental exposures on human reproductive health, which is of great interest to me because hormones are richly involved in that process.

Her work has focused on the effects of chemicals such as phthalates and Bisphenol A (BPA) on men's and women's reproductive health, as well as on the neurodevelopment of children. She is probably best known for a co-authored paper on the male infertility crisis, which became one of the most referenced scientific papers of 2017. She is also the author of the 2021 book Count Down, "How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race." I've read this book twice. Not only is it my go-to book for it's data and studies and facts, it's a visionary treatise on the subject. It's not just a data dump of bad news. It will get you thinking about the serious implications of this data, yes, but also provides solutions you can implement right now, today. Honestly, I don't know of too many scientists with such pressing information for our day.

In this podcast we look at genital/reproductive tract development and what occurs when that process is interrupted. We review the factors that contribute to semen quality and fertility in general. Dr Swan also talks about worldwide fertility rates dropping by 50% since 1960 and some factors that may be contributing. This is only a taste of topics discussed in this podcast episode. Let us know what stood out to you in the comment section.

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Dr Swan's book Countdown
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Timestamps:
00:00:00 Intro - Dr Swan's background
00:02:53 Layne's background
00:04:31 What is an environmental epidemiologist
00:05:06 Temporal trends and sperm count
00:06:17 Proper genital/reproductive tract in a fetus
00:09:50 Genital tract development interrupted
00:11:27 Maturation of sperm over about 60-75 days
00:12:17 Decline in number of sperm in semen
00:14:57 Interruption of testosterone in fetal development
00:19:10 Frequencies in deformities increasing
00:22:03 Sperm concentration and fertility
00:25:52 Factors that determine semen quality
00:28:20 Correlation between men's fertility and overall health
00:32:13 Link between testosterone levels and fertility
00:34:05 What to do for men with low testosterone
00:35:46 Some men's fertility issues can stem from mother's chemical exposure
00:36:17 Anogenital distance marker for androgen present during pregnancy
00:36:17 Anogenital linked to fertility
00:41:58 Check fertility
00:43:48 Worldwide fertility dropped by 50% between 1960 and 2015
00:47:13 Birthrate in US declining
00:50:56 Cause of birthrate decline
00:52:41 What can be done to improve fertility
00:55:14 Phthalates and other chemicals affecting fertility
00:58:35 Minimize hormone disruptor influence
01:02:39 Plastics and RICs
01:04:40 Water filters and hormone disruptors
01:05:39 Anti androgens can be intergenerational
01:09:23 Parents' health choices can impact their children's fertility
01:12:21 Testosterone's affects on the brain
01:16:34 Thank you Dr Swan


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