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Early Puberty on the Rise: Scientists Investigate Potential Causes
Children are entering puberty earlier than in previous generations, and scientists are struggling to determine exactly why. Recent research points to a combination of environmental, lifestyle, and metabolic factors, but the exact mechanisms remain unclear. The trend has been observed globally, and health experts are raising concerns about the long-term impacts.
On average, girls typically begin puberty at age 11 and boys at age 12. However, when girls start developing at age 7 or younger, or boys at age 8 or younger, this early onset—called precocious puberty—can lead to long-term health complications. These include obesity, diabetes, mental health disorders, and even breast cancer later in life.
The shift was first noticed in American girls during the 1990s, while European children seemed unaffected at the time. The rise in early puberty was initially linked to the growing obesity rates in the United States, but by the 2000s, the trend began emerging in Europe as well.
A significant marker of puberty in girls—breast development—has been starting earlier by about three months per decade, from 1977 to 2013. Dr. Anders Juul, a leading expert in pediatric endocrinology at Copenhagen University Hospital, has expressed concern about this ongoing shift, stating, “If we cannot identify the worst offenders and explain why this is happening, we will have no way to take preventive action.”
Several possible causes have been identified. Obesity continues to be a focus, with researchers suggesting that excess body fat increases the production of leptin, a hormone that signals readiness for puberty. The World Health Organization (WHO) reports that about one in three children in its Europe region are either overweight or obese, and this trend is especially pronounced in southern Europe.
Another leading theory involves exposure to endocrine-disrupting chemicals found in everyday products and food. Some scientists believe these chemicals could trigger early puberty, but evidence remains inconclusive.
The COVID-19 pandemic may have also played a role. A surge in cases of precocious puberty among girls was reported in Italy during the pandemic, possibly due to increased screen time, reduced physical activity, and heightened stress during lockdowns.
Researchers are continuing to investigate these potential causes, but the puzzle of early puberty remains unsolved, and more studies are needed to fully understand this growing concern.
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