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Study: How Pollution Can Affect Your Baby's Gender

2022-06-13 20:40:14Lifestyle SHKRUAR NGA REDAKSIA VOX
Study: How Pollution Can Affect Your Baby's Gender
Study: How Pollution Can Affect Your Baby's Gender

Exposure to pollution may have changed the ratio of boys and girls born to millions of parents in the US and Sweden, according to a study.

The study found that mercury, chromium and aluminum pollution was linked to the birth of more male babies, while lead contamination increased the number of female babies.

A team at the University of Chicago and the Karolinska Institutet, Stockholm, studied half of the U.S. population (150 million) and the entire Swedish population (9 million), revealing over 100 possible factors that are also related. As well as pollution, these included parental stress levels, poverty, crime and unemployment in the area - even air temperatures.

Published in the journal PLOS Computational Biology, the study examined the population of North America for more than eight years and Swedes for over 30 years - so the data is extremely comprehensive.

So how can pollution affect a child's sex?

The birth sex ratio (SRB) of infants is determined at conception when exactly half of the embryos must be girls and half boys.

But scientists are aware that hormonal factors can disrupt more embryos of each sex in different circumstances during pregnancy - which means that the ratios are naturally skewed.

However, this new research suggests that air and water pollutants also affect SRBs. The key word here is impact - they have found a correlation, rather than a cause and effect.

Influential air pollutants included iron, lead, mercury, carbon monoxide, aluminum, and polychlorinated biphenyls (PCBs). Water pollutants included chromium and arsenic.

"There are many myths about gender ratio and birth, but when you dig into the research, it turns out that everything that has been tested in real data has been done in relatively small samples and some statements are not based on observations at all," said Andrey Rzhetsky. , lead researcher at the University of Chicago, told the Guardian.

This is the first systematic investigation of multiple chemical pollutants and other environmental factors using large data sets from two continents, the researchers say.


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