Cannabis only lifestyle choice cutting male fertility
Men wanting to have children should stop smoking cannabis as it could have a serious impact on their fertility, the world's largest study of the effects of lifestyle on sperm suggests, according to the Daily Mail.
The drug doubles the chances of men under the age of 30 producing abnormal sperm - something that can have a serious impact on their chances of having children, according to the research.
Experts from the universities of Sheffield and Manchester found that smoking cannabis was the only lifestyle choice to have a negative impact on sperm production - contradicting long-held beliefs that fertility is reduced by obesity, alcohol and tobacco consumption, and the wearing of tight underwear.
The only lifestyle choice that had a major impact was smoking cannabis, which can reduce a man’s fertility by altering the size and shape of his sperm.
A similar effect was discovered in the summer, although experts suggest it isn’t heat but probably the length of the day and hormonal changes that are responsible.
When less than 4 per cent of a man’s sperm has a normal size and shape, statistics show he will find it harder to father a child and may need help from fertility techniques, including IVF.
Teams from the universities of Sheffield and Manchester carried out the world’s largest study on the effects of lifestyle on sperm.
Using data from 2,249 men attending fertility clinics around the UK, they compared the medical history and personal habits of 318 participants with less than 4 per cent of normal sperm and 1,652 whose sperm was of higher quality.
Men in the first group were nearly twice as likely to have used cannabis in the three months before giving a sample, if they were aged under 30. They were also nearly twice as likely to have produced the sample in the summer months.
The scientists believe younger men were most affected by cannabis simply because they were more likely to use greater quantities.
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