The BBC reports that sperm quality continues to drop. Specifically, researchers "found a 52.4% decline in sperm concentration, and a 59.3% decline in total sperm count in men from North America, Europe, Australia and New Zealand." While alarmist publications tout this as a 60% drop, the decline is accelerating and the researchers are concerned that inaction may lead to species extinction despite the effect not being observed in regions with high machismo, such as South America, Asia and Africa.
The study "aggregates 185 studies between 1973 and 2011, one of the largest ever undertaken." It supposedly overcomes selection bias occurring from patients attending fertility (virility?) clinics and selection bias of null results not being published in journals (churnals?). My intuition is that insights can be gained from studying transsexualism. Practitioners claim patients increase at the rate of 15% per year (doubling every five years), over many decades and with no end in sight. This is akin to Moore's law, Kryder's law, Butters' law, Hendy's law, Rider's law, Carlson's law or any other exponential halving or doubling. So, it doesn't take a genius to understand that it will become an increasingly widespread issue.
Regardless, masculine medical problems are vastly under-represented. By some estimates, spending on male medical problems is about 1/4 of spending on female medical problems. For example, when a man seeks help for a legitimate medical issue, such as declining testosterone, a patient at the lower end of the "normal" range may be denied treatment even if he is constantly exhausted.
Well, take care of yourself. Eat properly. Drink properly. Rest properly. Stay active. And if healthy food and exercise won't fix accumulated problems, consider hormone replacement. You may also want to watch two films which seem to be mentioned with increasing frequency and seem to predict our era with some accuracy: Children Of Men and Colossus: The Forbin Project. Children Of Men is the second bleakest film I've ever seen and the film I've seen most during its initial cinema release. It explores the scenario of global infertility leading to economic collapse. In addition to a nexus of cast and crew, the seamless plot and astounding compositing, the film is a fantastic example of mise-en-scène which is best explained by example.
Anyhow, enjoy the films and get your medical problems addressed.
Disclosure: People in my family are affected by virility and hormone problems. I have a professional interest in film, media encoding and art education.
Soy - phytoestrogen - debated.
Coca Cola - reduces sperm count by 30% [caffeineinformer.com] - coffee and tea do not.
It's probably not just something we consume:
Asians consume soy 10 times more and don't show any symptoms.
Same with Coca Cola. Hugely popular in South America and the Middle East and no problems there. Also, Coca Cola keeps switching sweeteners and adjust their formulas so the continuous trend really doesn't make sense.
It's not a lack of exercise and obesity either. Plenty of those in South America and within African Americans.
Not antibiotics. Plenty of that all around.
I would have guessed lactose on account of Black and Asians being too intolerant to milk. But I think they consume plenty of dairy in the Middle East and India so I'm not too sure... Similarly, Alcohol has it's own exceptions.
Not a pesticide. Grain moves around the globe all the time.
Overall, for it to stay hidden for so long, it's probably a combination of Anglo-Saxon genetics with (aforementioned?) environmental conditions.
You don't know how great their fertility would be if they didn't eat all that soy! ;-)
Perhaps it is the corn syrup (now called "natural sweetener" in the US) used in so many products? Is this type of slow poison used worldwide?
Coca Cola diet doesn't has corn syrup.
But the regular Coke does, as does every other major (and most minor) manufacturer of soda, candies, etc etc. Not to mention a shit-ton of other manufactured and processed foods. If you think drinking Diet Coke means you dodged a bullet then you are mistaken.
No, it is mostly used in the US because of the government subsidies for corn growers there.
A friend thinks that industrial farming is the problem. Specifically, by volume, an increasing proportion of chicken, beef and pork is female. Males are usually killed before they grow to adults because they don't lay eggs, produce milk or have multiple pregnancies but do consume the same or more food. Historically, this wadn't an issue but farming has become industrial and very competitive. To counter the bias of xeno-estrogen and obtain a traditional mix of xeno-hormones, he eats veal on a regular basis.
Anyhow, it would be worthwhile to compare virility versus farming practices.
Farming been industrialized in China for quite some time.
I'm gonna call bullshit on part of that. Chicken produced for meat is overwhelmingly male -- not only are cockerels bigger at a given age, but also better feed conversion -- that is, they get bigger, and they eat more, but they get bigger by more than they eat more. It's possible (not sure) some specific products like chicken nuggets, or anything else with "mechanically separated chicken" in it, may skew female from using old laying hens in them, but actual chicken meat is basically all cockerels grown for the purpose.
The idea that chicken meat and chicken eggs come from the same flock hasn't been true, in terms of commercial operations, for half a century or more.
It's "probably" also the fact we allow the weak and sick survive with all the fancy healthcare. Right-thinking Americans are only thinking of the greater good when they try to take it away from their fellow countrymen. Saving a nickel is just a side-benefit.