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Obese men have poorer quality sperm, perhaps because too much fat around their testicles causes them to heat up, scientists have suggested.
The heaviest men had a higher proportion of abnormal sperm, as well as other problems.
The scientists told a European fertility conference losing weight probably boosted fertility.
Being obese is already known to affect women's chances of getting pregnant.
"But if weight actually has a detrimental effect on sperm quality, that's really interesting," he said
"It's one more reason for men to lose weight."