Obesity may decrease male fertility
The sperm of obese men is poorer which may have a direct impact on their fertility, says a study by the Eylau-Unilabs Medical Biology Laboratory in Paris, France, and presented in Stockholm, Sweden, at the ESHRE The largest study ever done on the subject was done at the end of 2010 with 1,940 people. The researchers analyzed the sperm volume, its pH, the sperm concentration per ml of sperm, their total number, their mobility, their vitality, the rate of atypical shapes and other data. All of these factors were related to the body mass index (BMI) of each of the volunteers.
With a BMI (weight divided by squared height) less than 18, the person may be considered lean; between 18 and 25, the weight is normal; between 25.1 and 30, there is overweight, and the individual is obese when the result exceeds 30.
According to the authors of the research, the higher the overweight, the lower the sperm quality, mainly regarding the concentration and the total number of spermatozoa. In addition to this concentration, 10% is lower in overweight patients and 20% less in obese subjects, the sperm motility drops 10%.
The total sperm count, from 184 to 194 million ml among people with weight normal, falls to 164 to 186 among the overweight and 135 to 157 among the obese. The number of people suffering from a total absence of sperm (azoospermia) represents 1% when the weight is normal, but increases to 3.8% among obese.
According to the scientists, this is due to disorders hormones caused by overweight, which make it difficult to manufacture healthy new sperm. There is, however, a comforting element: 300 patients have been able to regain healthy sperm through weight loss.
Pollution and infertility
Poor air quality is another factor that influences infertility in men. According to a study of the Reproductive Toxicology and Andrology Unit of the Hospital das Clinicas of FMUSP, linked to the State Department of Health of São Paulo and coordinated by the urologist Jorge Hallak, pollution is one of the most serious modern causes of male infertility. > The study evaluated 748 workers who inhale the air from major public highways, such as bus and taxi drivers, and the result was surprising. Those who breathe a lot of pollution showed higher concentration of free radicals in the blood, which causes a decrease in sperm quality. The numbers showed that of the 748 surveyed, 500 had some type of fertility change. The explanation, according to the expert Jorge Hallak, is in the fuel that Brazilian automobiles use. "There is a lot of heavy metals in domestic gasoline, which directly affects the body," says the urologist.
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