1. Plunging sperm counts provoke alarm

    Plunging sperm counts provoke alarm

    Although falling male sperm counts have been reported in the developed world since 1992, the first systematic review and meta-analysis of sperm count trends was only published recently by Hagai Levine and others in Human Reproduction Update. This latest research analysed 185 studies involving nearly 43,000 men who provided semen samples from 1973 to 2011. The researchers found a 54.2 per cent drop in sperm concentration (number of sperm per millilitre) and a 59.3 per cent drop in total sperm count (total number of sperm in ejaculate) over the past 40 years among men from North America ...

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