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.
For more about male infertility, visit the U.S. National Library of Medicine.
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