Girls' puberty age falls to ten

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Plyšáček
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Girls' puberty age falls to ten

Příspěvekod Plyšáček » 8.2.2017 13:09:17

Stress of family breakdown and rise of obesity levels blamed as girls' puberty age falls to ten (Dailymail)



  • Broken homes, stress and obesity behind girls entering puberty earlier than ever
  • US study finds girls with absent fathers are 2.4 times more likely to develop breast tissue at a younger age
  • 'Strong link' between early puberty and early onset of sexual activity and teenage pregnancy

The stress of family breakdown could be to blame for girls starting puberty at the age of ten, according to scientists.
The average age at which girls start growing breast tissue has fallen over the past 15 years and it usually begins when they are still at primary school.
This is thought to be caused by a hormone imbalance, which in turn has been linked to a number of factors, including rising levels of obesity.
However, experts are increasingly concerned that the strain of modern relationships may also be a key factor.
Professor Richard Sharpe, of Edinburgh University said the trend towards broken families and absent fathers could be triggering the hormone imbalance.
He said long-term stress could also be caused by the higher expectations put on girls to achieve at school and fit in with the crowd.
Studies have shown breast development – the first sign of puberty – begins on average at the age of ten, which is five years earlier than during the 19th century.
Doctors say the risks of this include premature sexualisation of young girls and teenage pregnancy. It is also linked to an increased risk of breast cancer in later life.
Professor Sharpe, group leader at the Centre for Reproductive Health, told the Cheltenham Science Festival yesterday: ‘We are seeing early puberty in situations which we would deem stressful for girls, for example being adopted or growing up without their biological father in the house.
'There may be a stepfather or the child is having to live in two homes. That is all somewhat stressful and it is much more common nowadays than it was.
‘It may even be that it is all the expectations of the modern world on girls, because there’s been a radical change in what their expectations are.’
Two years ago a study by US researchers found girls of all backgrounds whose fathers had left home were 2.4 times as likely to develop breasts at a younger age.
Many began at nine and some as young as seven, according to a study of 440 girls by the University of California Berkeley.
One explanation is to do with overproduction of the male hormone androgen – which girls naturally produce during puberty – but could be produced in higher quantities and earlier due to stress.
Professor Sharpe said that researchers are looking at ‘societal factors’ to explain why breast development is getting earlier, while menstruation is not.
Breast tissue and body hair are the first stages of puberty, followed by menstruation, but the average age for girls to start their period has been 12-and-a-half since the 1960s.
Professor Sharpe said it was difficult to establish exactly how different hormones were interacting to trigger early breast development.
Dr Tabitha Randell, of Nottingham University Hospitals NHS Trust, also speaking at the festival, said: ‘We need to help parents deal with the physical and psychological consequences of early puberty which are very serious and can very distressing for the child.
‘There is a strong link with early onset of sexual activity when they are not emotionally ready, and with teenage pregnancy for which already have the highest level in Europe.’
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Neptun
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Girls' puberty age falls to ten

Příspěvekod Neptun » 8.2.2017 14:04:58

Some of the factors mentioned above have already been published in the study Macleod M, 2007: Her father's daughter. NEW SCIENTIST 193: 38-41:
The speed at which children mature may partly depend on how their parents conduct their own relationships. More and more evidence suggests that a girl's sexual development is affected by her family environment, and fathers play a crucial role. Several studies examining the relationship between family background and reproductive strategy have since revealed that family stress can accelerate the onset of menarche by around four to six months. The younger a girl is when she reaches puberty, the higher the likelihood she is to suffer from health problems like breast cancer later in life. Studies have found that the absence of a biological father was associated with earlier menarche, but they also found that the presence of half-brothers and stepbrothers had the same effect as pheromones produced by unrelated males serve to accelerate puberty.
But there are some differences: In this study from 2007, earlier onset of menstruation is mentioned, unlike in the study cited in Dailymail. Not only stress (psychical stimuli) but also pheromones (perceived as body smell) seems to be responsible. Smell of father should keep the hormonal level lower while absence of the smell of father or smell of unrelated men accelerate the development.

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