Here is another of those studies that makes us wonder who thinks up this stuff. The British Journal of Sports Medicine, looked at the lifestyles of 189 healthy men between the ages of 18 and 22, during a three-month period to establish a link between environmental factors and semen quality. Its finding - men who watch more than 20 hours of television a week risk halving their sperm count.
It said, while regular, vigorous exercise was shown to boost sperm
count, excessive television-watching can counteract the positive
effects of physical activity and can have a major impact on a man’s
ability to reproduce.
Another study by researchers at the University of Sheffield and
Manchester compared the lifestyles of 939 men with poor sperm
quality with 1,310 men with normal sperm quality. It found “little
evidence” that a high BMI, excessive alcohol consumption or
recreational drugs were contributing factors to sperm quality. It
also found that wearing boxer shorts rather than tighter underwear
was linked to higher sperm levels. There was even evidence that high
levels of physical activity might have a detrimental effect on
quality and quantity.
Dr George Chavarro from the Department of Nutrition at Harvard
School at Public Health, senior author of the recent study said, “In
general, very little is known about what influences sperm count.” Too
bad for us their fathers didn't watch more TV.