This article is from the source 'bbc' and was first published or seen on . It last changed over 40 days ago and won't be checked again for changes.
You can find the current article at its original source at http://www.bbc.co.uk/news/health-40719743
The article has changed 5 times. There is an RSS feed of changes available.
| Version 0 | Version 1 |
|---|---|
| Sperm count drop 'may lead to human extinction' | Sperm count drop 'may lead to human extinction' |
| (about 4 hours later) | |
| Humans could become extinct if sperm counts in men continue to fall at current rates, a doctor has warned. | |
| Researchers assessing the results of nearly 200 separate studies say sperm counts among men from these areas seem to have halved in less than 40 years. | Researchers assessing the results of nearly 200 separate studies say sperm counts among men from these areas seem to have halved in less than 40 years. |
| Some experts are sceptical of the findings, published in the Human Reproduction Update. | |
| But lead researcher Dr Hagai Levine said he was "very worried" about what might happen in the future. | But lead researcher Dr Hagai Levine said he was "very worried" about what might happen in the future. |
| The assessment brings together the results of 185 studies between 1973 and 2011, one of the largest ever undertaken. | The assessment brings together the results of 185 studies between 1973 and 2011, one of the largest ever undertaken. |
| Dr Levine, an epidemiologist, told the BBC that if the trend continued humans would become extinct. | Dr Levine, an epidemiologist, told the BBC that if the trend continued humans would become extinct. |
| Decline rate 'increasing' | Decline rate 'increasing' |
| "If we will not change the ways that we are living and the environment and the chemicals that we are exposed to, I am very worried about what will happen in the future," he said. | "If we will not change the ways that we are living and the environment and the chemicals that we are exposed to, I am very worried about what will happen in the future," he said. |
| "Eventually we may have a problem, and with reproduction in general, and it may be the extinction of the human species." | "Eventually we may have a problem, and with reproduction in general, and it may be the extinction of the human species." |
| Scientists not involved in the study have praised the quality of the research but say that it may be premature to come to such a conclusion. | Scientists not involved in the study have praised the quality of the research but say that it may be premature to come to such a conclusion. |
| Dr Levine, from the Hebrew University of Jerusalem, found a 52.4% decline in sperm concentration, and a 59.3% decline in total sperm count in men from North America, Europe, Australia and New Zealand. | Dr Levine, from the Hebrew University of Jerusalem, found a 52.4% decline in sperm concentration, and a 59.3% decline in total sperm count in men from North America, Europe, Australia and New Zealand. |
| The study also indicates the rate of decline among men living in these countries is continuing and possibly even increasing. | The study also indicates the rate of decline among men living in these countries is continuing and possibly even increasing. |
| Previous research 'flawed' | Previous research 'flawed' |
| In contrast, no significant decline was seen in South America, Asia and Africa, but the researchers point out that far fewer studies have been conducted on these continents. However, Dr Levine is concerned that eventually sperm counts could fall in these places too. | |
| Many previous studies have indicated similar sharp declines in sperm count in developed economies, but sceptics say that a large proportion of them have been flawed. | Many previous studies have indicated similar sharp declines in sperm count in developed economies, but sceptics say that a large proportion of them have been flawed. |
| Some have investigated a relatively small number of men or included only men who attend fertility clinics, and so are in any case more likely to have low sperm counts. | Some have investigated a relatively small number of men or included only men who attend fertility clinics, and so are in any case more likely to have low sperm counts. |
| There is also concern that studies that claim to show a decline in sperm counts are more likely to get published in scientific journals than those that do not. | There is also concern that studies that claim to show a decline in sperm counts are more likely to get published in scientific journals than those that do not. |
| Another difficulty is that early methods of counting sperm may have overestimated the true count. | Another difficulty is that early methods of counting sperm may have overestimated the true count. |
| Taken together these factors may have created a false view of falling sperm counts. | Taken together these factors may have created a false view of falling sperm counts. |
| But the researchers claim to have accounted for some of these deficiencies, leaving some doubters, such as Prof Allan Pacey of Sheffield University, less sceptical. | But the researchers claim to have accounted for some of these deficiencies, leaving some doubters, such as Prof Allan Pacey of Sheffield University, less sceptical. |
| He said: "I've never been particularly convinced by the many studies published so far claiming that human sperm counts have declined in the recent past." | He said: "I've never been particularly convinced by the many studies published so far claiming that human sperm counts have declined in the recent past." |
| "However, the study today by Dr Levine and his colleagues deals head-on with many of the deficiencies of previous studies." | "However, the study today by Dr Levine and his colleagues deals head-on with many of the deficiencies of previous studies." |
| Smoking and obesity | Smoking and obesity |
| But Prof Pacey believes that although the new study has reduced the possibility of errors it does not entirely remove them. So, he says, the results should be treated with caution. | But Prof Pacey believes that although the new study has reduced the possibility of errors it does not entirely remove them. So, he says, the results should be treated with caution. |
| "The debate has not yet been resolved and there is clearly much work still to be done. | "The debate has not yet been resolved and there is clearly much work still to be done. |
| "However, the paper does represent a step forward in the clarity of the data which might ultimately allow us to define better studies to examine this issue." | "However, the paper does represent a step forward in the clarity of the data which might ultimately allow us to define better studies to examine this issue." |
| There is no clear evidence for the reason for this apparent decrease. But it has been linked with exposure to chemicals used in pesticides and plastics, obesity, smoking, stress, diet, and even watching too much TV. | There is no clear evidence for the reason for this apparent decrease. But it has been linked with exposure to chemicals used in pesticides and plastics, obesity, smoking, stress, diet, and even watching too much TV. |
| Dr Levine says that there is an urgent need to find out why sperm counts are decreasing and to find ways of reversing the trend. | Dr Levine says that there is an urgent need to find out why sperm counts are decreasing and to find ways of reversing the trend. |
| "We must take action - for example, better regulation of man-made chemicals - and we must continue our efforts on tackling smoking and obesity." | "We must take action - for example, better regulation of man-made chemicals - and we must continue our efforts on tackling smoking and obesity." |
| Follow Pallab on Twitter | Follow Pallab on Twitter |