Why are testosterone levels declining in men?

Sitting on your couch all day and watching Netflix/playing video games isn't improving your health. Sitting in a cubicle for 8-hour days is not good for your health. Men used to walk and lift things during the day, all day. Humans are built for endurance and movement. We are not doing that today, besides @randomroger...

Processed foods, I believe are the biggest problem with obesity. Men born before 1950 weren't obese and they weren't necessarily healthy. Ever seen Mad Men? They didn't go to the gym. They drank and smoked all day. They died fairly young. But, their food was real. Even the crappy foods they ate.

https://www.nbcnews.com/science/science-news/microplastics-human-body-know-dont-know-rcna23331

There's no way this is healthy for us.

https://www.cedars-sinai.edu/research/departments-institutes/diabetes-obesity/areas/effects-of-high-altitude.html

Men at higher elevations have lower levels of obesity. Could it just be correlated with the higher cost of living areas?

As people become more obese, their children have worse genetics. The cycle will continue.

I'm not sure. The trend is bad and unless we change the way we live, get rid of the chemicals in our food, and reduce the plastic in society, it will likely continue.