Are microplastics contributing to the global decline in sperm count?

Sperm counts in Western countries have declined by more than 50% over the past five decades, and microplastic exposure is increasingly recognized as one likely contributing factor. The timeline of this decline coincides with the massive growth of synthetic textile production, which began in the 1970s and accelerated through the fast fashion era. While sperm count decline is likely multifactorial, the presence of microplastics in testicular tissue and semen, combined with their demonstrated ability to damage sperm at the cellular level, positions them as a significant piece of the puzzle.

The mechanisms through which microplastics impair sperm are well documented in laboratory and animal studies: oxidative stress damages mitochondria and DNA, the blood-testis barrier is compromised via the ROS/mTOR pathway, electrostatic fields from polyester disrupt spermatogenesis, and chemical additives like BPA and phthalates mimic or block reproductive hormones. Population-level exposure to these stressors through clothing alone is universal and continuous, making textiles a plausible contributor to a population-level decline.

Addressing the sperm count crisis will require action on multiple fronts, but individuals can take immediate steps to reduce their personal exposure. Eliminating synthetic fabrics from underwear, sleepwear, and activewear removes the textile sources closest to the reproductive system. ONDU was founded on the principle that the clothes you wear should support your health, not undermine it, and our curated brands provide practical alternatives for anyone concerned about this growing public health issue.