Michael Carroll is a biologist and reproductive scientist. His book, Your Nuts, has arrived in tandem with falling birth rates. He says there is evidence to support a decline in sperm count. However, it's just not that simple, he says.
Researchers are starting to call the ‘disappointment gap’ between size of family people want and one they have. For men, a diagnosis of low fertility engenders ‘feelings of shame’ and ‘self-worth’
The US Department of War is mandating all servicemen over 30 have testosterone tested. Smoking is strongly associated with lower sperm count and DNA damage. Obesity has also been linked to reduced testosterone levels.
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