Cannabis use affects sperm quality

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http://www.sciencealert.com.au/news/20140606-25631.html *


Felicity Nelson
Friday, 06 June 2014


Cannabis use changes the size and shape of sperm, potentially affecting male fertility.

Image: Gabriel Sancho [cartoon onsite*]

The world's largest study on sperm shape and size has identified cannabis as a major predictor of sperm abnormality.

Season and frequency of sexual activity were also major lifestyle factors affecting sperm but, surprisingly, cigarette and alcohol consumption had little effect.

The study included a sample of sperm from almost 2,000 men across the UK. The lifestyles of men with less than 4% normal sperm (defined as sperm with a typical shape and size) were compared against men with sperm samples with greater than 4% normality.

The University of Sheffield reported in a press release, "Men who produced ejaculates with less than 4% normal sperm were nearly twice as likely to have produced the sample in the summer months, or if they were younger than 30 years old, to have used cannabis in the three month period prior to ejaculation."

The researchers advise that men aiming to start a family should probably stop using cannabis as previous research has shown that good sperm morphology is crucial to successful conception.

The research was published in the journal Human Reproduction last week.


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It should be noted that cultures which have been using cannabis for thousands of years seem to have no problem maintaining fertility levels, and only the fittest, and luckiest of the many millions of spermatozoa in each ejaculation get the chance to fertilise the ovum, so any abnormal / defective ones get weeded out in the race.