Sperm counts among western men have halved in last 40 years

Yeah, and the diet changed from protein and fat to sugar and wheat about 40 years ago.

Coincidence? Hardly.

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Humans have eaten large amounts of grains and wheat since 11000 years ago. Bread has been a staple since 5000 years ago and possibly much earlier, with grinding stones dating to 30000 years ago.

The paleolithic diet has a cool story but the anthropological evidence does not support it.

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[–] phoxy 3 points (+3|-0)

Stress. It explains the skyrocketing obesity, diabetes, cardiac disease, anxiety and depression rates, erectile dysfunction, libido issues, low sperm quantity and quality, even IBS.

Interestingly, the stress may be a result of inequality. There is a clear causal link from social position to levels of stress hormones- the lower your social position the more stressed you are.

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Sperm counts among western men have halved in last 40 years

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/s/Science