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Exercise Might Boost Men's Sperm Counts

Meanwhile, other research saw no fertility effects from caffeine, alcohol

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The study did not find any difference in the quality of sperm or how well it traveled in the body related to exercise.

Although the studies found associations between exercise levels and sperm concentration, it did not prove a cause-and-effect relationship.

Two other studies assessing male fertility looked at the potential impact of alcohol or caffeine.

One study reviewed the alcohol and caffeine intake of 166 male infertility patients, and found no link with the men's sperm counts.

"We found that neither alcohol nor caffeine affected semen quality, which serves as a proxy for male fertility potential," Chavarro said.

A second study by French researchers also looked at caffeine intake, but focused on the possibility that caffeine could do harm to the quality of sperm as well as the quantity.

The study, which involved nearly 4,500 men, reviewed semen volume and sperm counts, and performed genetic analysis to see if caffeine caused damage to sperm DNA.

The researchers reported that caffeine intake overall did not have a detrimental effect on semen. In particular, caffeine did not seem to cause any significant damage to the DNA carried by the sperm.

Until now, research into the effects of caffeine and alcohol on male fertility has been very mixed, Chavarro said.

"There have been many papers suggesting that alcohol and caffeine may be deleterious to fertility," he said. "But there have been a few papers that say caffeine might help sperm motility, and helps sperm move faster with improved patterns."

Because the new research was presented at a medical meeting, all data and conclusions should be viewed as preliminary until published in a peer-reviewed journal.

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