Bisphenol A Exposure Interferes with Reproductive Hormones and Decreases Sperm Counts: A Systematic Review and Meta-Analysis of Epidemiological Studies.
Plain-language summary
This study set out to clarify how bisphenol A (BPA, a chemical used in food packaging and container linings) affects men's reproductive health. It pooled 18 studies that measured BPA in urine and compared it against sperm counts and hormones. Men with more BPA in their urine had lower sperm concentration and lower total sperm count. Their hormones shifted the same way: higher SHBG (sex hormone-binding globulin, the protein that binds testosterone and sets how much of it is free and usable, so a higher level leaves less available), higher estradiol, and less active androgen, a pattern the authors read as BPA disrupting the hormone system rather than improving it, and one that leaves a man with less testosterone free and usable. For the question of whether BPA pushes men below the normal reference range for sperm quality, no reliable relationship was found.
Key findings
- Men with more BPA in their urine had lower sperm concentration and lower total sperm count.
- BPA went with higher SHBG, higher estradiol and less active androgen. The authors read that as BPA disrupting the hormone system, and it leaves less testosterone free and usable, which is the unhelpful direction.
- For whether BPA pushes sperm quality below the normal reference range, no reliable relationship was found.
How to analyze the study yourself
- Study type
- Meta-analyses pool data from multiple studies to spot patterns, but they rely on the quality and design of the included studies, which here were observational and cannot prove cause and effect.
- Population
- Not reported
- Funding
- Not reported
- Takeaway
- This review found that men with more BPA in their urine had lower sperm counts and a hormone pattern that leaves less testosterone free and usable, though it could not establish that BPA pushes a man below the normal range. If you are working on fertility, it may be worth moving food out of plastic and into glass, and never heating food in a plastic container, since packaging is where most BPA exposure comes from.