Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race

By Shanna H. Swan, Stacey Colino

Categories: Health, Fitness & Dieting, Science & Math

Count Down (2021, Scribner) is epidemiologist Shanna H. Swan's account, written with Stacey Colino, of the threats to human reproduction. Swan draws on the 2017 meta-analysis she co-led of 185 studies, which found that sperm counts among men in Western countries fell by more than half between 1973 and 2011. She links that decline and changes in sexual development to lifestyle factors and to endocrine-disrupting chemicals such as phthalates in everyday products, and offers practical ways to reduce exposure.

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• Joe Rogan: “Dr. Shanna Swan from Harvard, she wrote this great book called... Countdown... It's a really fascinating book and she's really interesting.”