Ultra-processed foods harm men’s health. They increase weight, disrupt hormones, decrease testosterone, and introduce harmful substances linked to declining sperm quality. They contain industrial and synthetic ingredients. This may be why over the past 50 years, sperm quality has plummeted.

[u/mvea]

https://cbmr.ku.dk/news/2025/not-all-calories-are-equal-ultra-processed-foods-harm-mens-health/

[u/clyypzz]

This is most likely just one factor of the problem. Others might be a far more sedentary life and work, more pollution of new types such as endocrine disruptores like BPA, PFAS, lead, aluminium, and tons of other stuff plus social factors plus stress from a changing society and so on and so on

[u/S14Ryan → u/clyypzz]

I would probably take lead out of your list. Lead contamination and  pollution has dropped significantly in the last 50 years. 

[u/S14Ryan → u/[deleted]]

This is a pretty useless thing to add, as there is no good amount of it, there is a VERY bad amount of it, which nearly every person in the world born before around 1990 suffered from. Kids aren’t born chalk-full of lead anymore, despite being born with a non-zero amount, which will realistically never change.

[u/makesufeelgood → u/S14Ryan]

Chalk full? That's some good bone apple tea right there