Can microplastics from food packaging harm a teenage boy's fertility?

What's actually in it

Polystyrene nanoplastics shed from disposable cups, takeout containers, and food packaging. They're small enough to cross from the gut into the bloodstream. In adults, research has found them in blood, liver, and testes. During adolescence, when the male reproductive system is still developing, the timing of this exposure matters a lot.

The reproductive system depends on clear hormonal signals during puberty. Testosterone and its precursors build testicular structure and set up sperm production for life. Anything that disrupts that process during the developmental window can leave permanent effects.

What the research says

A 2026 study in J Nanobiotechnology exposed adolescent male animals to polystyrene nanoplastics at levels consistent with human dietary exposure. The result: reduced sperm quality, damaged testicular tissue, and lower testosterone.

The mechanism runs through the gut. Nanoplastics disrupt the gut microbiome, which then disrupts the gut-testis signaling pathway. This axis connects gut health to hormone production in the testes. When the gut microbiome is thrown off, the testicular cells that make testosterone get less of the signal they need.

The damage was measurable at the structural level: Sertoli cells (which support sperm development) and Leydig cells (which make testosterone) both showed signs of dysfunction after nanoplastic exposure.

Teens eat a lot of food from plastic packaging. Reducing hot food in polystyrene containers and switching to non-plastic drinkware are the most direct ways to cut exposure during the years it matters most.