Translated via Google : http://www.lanutrition.fr/les-news/la-qualite-du-sperme-en-fort-declin-en-france.html
A new study of more than 26,600 men confirms, according to others, a decline in "significant" concentration of sperm sperm quality and in France. Between 1989 and 2005, the decrease of the concentration is continuous (1.9% per year) for a total reduction of 32.2%. Thus, in a man of 35 years, the number of spermatozoa increased from 73.6 million / ml to 49.9 million / ml on average.
The study was published Tuesday, December 4 in the journal Human Reproduction.
http://humrep.oxford...415.short?rss=1
It also shows that the proportion of normally shaped sperm is also down 33.4% over the same period.
But the reality may be even grimmer because the sample studied (partners of infertile women) have a profile healthier than the general population of smokers with less and less obese.
Sperm concentrations theoretically remain in the area for fertility according to WHO criteria (more than 15 million / ml). But according to some studies, concentrations below 55 million / ml could affect reproduction and delay the time of conception.
"To our knowledge, the authors write, this is the first study finding a reduction in severe and general sperm concentration and morphology at the scale of an entire country and a significant period. (... ) This is a serious warning. "They add that "the relationship with the environment in particular must be determined."
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http://www.lanutriti...-du-sperme.html
As the great French study published yesterday, which caused a stir in the newsroom and probably among couples seeking to have children: sperm quality is in sharp decline in France. Conducted over 26,600 men it shows that between 1989 and 2005, the concentration of sperm decreased by an average of 32.2%. Thus, in a man of 35 years, the number of spermatozoa increased from 73.6 million / ml to 49.9 million / ml on average, a level of concern even if it can still make babies. The proportion of normally shaped sperm is also down 33.4% over the same period.
The study comes on no other, more limited.
For example, a survey conducted in Paris found a decrease of 2.1% per annum of the sperm concentration sperm donors between 1973 and 1992. The researchers also reported that the concentration of sperm of a man aged 30, born in 1945 was 102 million / ml but only 51 million / ml in a man thirty-born in 1962.
To explain the decline in sperm count and the total number of normal sperm, the traditional factors are incriminated: plasticizers, pesticides, drug residues in water beverages, obesity, the same people who were singled out in the years 1990 when I followed these issues Sciences et Avenir and it became clear that something was happening at the sperm populations in developed countries. These environmental toxins called "endocrine disruptors" certainly play a role.
But it is only very recently that we began to look at the supply side. And the surprise is waiting for you!
Myriam Afeiche, a researcher at the School of Public Health Harvard presented October 23, 2012 a study that has been much talk at the 68th Meeting of the American Society for Reproductive Medicine, which was held in San Diego (California). She sought an association between diet and sperm quality of 189 young men aged 18 to 22 years from a U.S. study, the Rochester Young Men's Study. Results: Men who consume between 1.3 and 7.5 servings of dairy per day whole less of normal sperm than men who consume little dairy (zero to 1.2 servings per day). The researchers found that compared to others, men who consumed more than three servings of whole dairy products had a 25% drop in sperm quality. A portion corresponded to 30 g of cheese, a spoonful of cream, an ice cream cone or a glass of whole milk.
Dr. Afeiche explains the content of cow's milk in female hormones may explain these changes. Whole cow's milk also more likely to contain pesticides and other pollutants that have an affinity for fat. This may be surprising to discover that there are hormones in cow's milk. There because the cows are milked today for a large part of their pregnancy, which was not the case in the past, as shown by surveys in the tribes of nomadic pastoralists. Production first!
When I Reims Conference in November 2012, I gave some figures. For example, there are between 40 and 55 pg / ml estrone sulfate free and 200 to 370 pg / ml estrone sulfate conjugate in cow's milk. This hormone is not destroyed by sterilization and part is converted by each of us estradiol. Moreover, there are also estradiol in milk. The total estrogen (free and conjugated) can exceed 700 pg / ml in skim milk. Milk fat contain their side very high levels of progesterone.
Japanese researchers who investigate the fertility decline in the country, have found an association with the recent explosion in the consumption of dairy products. They calculated that a boy who consumed the equivalent of 50 cL of milk per day, "receives" 160 ng estrone sulfate, a portion of which is converted to estradiol. A closer 40-100 ng daily that the body produces naturally.
This leads us to the French situation. The French consume about 5 kg of cheese per person per year in 1950. This figure was 18 kg in 1980, 23.5 kg in 2000, a little over 24 kg in 2009. We are the second largest consumers of cheese in Europe (kg / person), behind the Greeks. And we occupy the first place in the consumption of butter (8 kg / person / year).
Here is the hypothesis: a major hormonal changes in our environment over the last 60 years in France, is that we are exposed at an early age to female hormones dairy products, due to the change of the mode of production of milk and our appetite for cheese and butter. This exhibition could at least partly explain the decline in sperm quality that is recognized today.
To test this hypothesis, or the reverse, it would launch a study on the issue. I appeal to the dairy industry ...
