“Studies have come to conflicting conclusions as to whether obesity impairs a man's fertility. But several recent ones have found that obese men tend to have poorer quality sperm than leaner men do -- including lower sperm counts and fewer progressively motile sperm, which refers to sperm that swim forward in a straight line rather than moving about aimlessly. ‘To our knowledge, ours is the first study proposing a deleterious effect of obesity on epididymal function,’ lead researcher Dr. Ana Carolina Martini, of the National University of Cor...
http://www.reuters.com/article/idUSTRE61G55620100217
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