Caffeine and sperm

Men who drank two or more cups of strong coffee a day had just a one in five chance of becoming fathers through IVF. However, for those who drank less than a cup, the chance of having a child rose to nearly 52 per cent. The researchers at Massachusetts General Hospital, Boston, believe that caffeine may harm sperm at a molecular level. A shot of espresso contains around mg of caffeine.
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Too much coffee damages fertility for men

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Coffee makes sperm speed up | New Scientist

Data sharing not applicable to this article as no datasets were generated or analysed during the current study. Semen quality, a predictor of male fertility, has been suggested declining worldwide. All pertinent reports were retrieved and the relative reference lists were systematically searched in order to identify any potential additional studies that could be included. Overall, they included 19, men. Semen parameters did not seem affected by caffeine intake, at least caffeine from coffee, tea and cocoa drinks, in most studies. Conversely, other contributions suggested a negative effect of cola-containing beverages and caffeine-containing soft drinks on semen volume, count and concentration. Finally, male coffee drinking was associated to prolonged time to pregnancy in some, but not all, studies.
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Sperm count: Drinking THIS many cups of coffee a day can harm male fertility

In the UK we drink approximately 55 million cups of coffee per day, according to the British Coffee Association. Recent research suggests it can also help you live longer. The findings, published in the Nutrition Journal, reveal that daily caffeine intake it ok - up until a certain point. In a number of studies the researchers found that daily caffeine intake may cause increased sperm DNA damage in the form of double-strand DNA breaks and aneuploidy, the presence of an abnormal number of chromosomes.
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Caffeine is the most widely consumed psychoactive drug in the world. Hundreds of millions of people are technically junkies, imbibing that morning brew simply to stave off the fatiguing effects of caffeine withdrawal. As caffeine is so widely consumed, scientists regularly study the stimulant. After all, many of them are self-professed junkies, as well, and so nurture a personal interest.
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