
The link is unlikely to be due to caffeine, the researchers say, because coffee did not 've the same effect. Instead, other ingredients in the beverage or an unhealthy lifestyle could be involved.
Kold Jensen, who led the new research, said only a few studies 've looked at caffeine's impact on reproductive health in men. The participants 've generally been a very select group, such as infertile men, & the results 've been conflicting.
Danish youth has been upping their consumption of caffeine-containing soft drinks over the last decades & the researchers decided to study how this might affect their reproductive health.
More than 2,500 young men were included in their study. Those who didn't drink cola had better sperm quality averaging 50 million sperm per millilitre semen & tended to 've a healthier lifestyle. In contrast, the 93 men who drank more than one litre a day had only 35 million sperm per millilitre. However, they also ate more fast foods, less fruit & vegetables.
It is still not clear if the cola or the unhealthy lifestyle, or both, is to blame & the scientists said further research was needed.
The study was published in the American Journal of Epidemiology.
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