How Blue Light from Screens Could Trigger Early Puberty and Stunt Growth in Children

Blue Light Exposure and Growth in Rats

Research presented at the 62nd Annual European Society for Pediatric Endocrinology Meeting indicates that blue light exposure, like that from smartphones and tablets, can speed up bone growth and trigger early puberty in rats. This raises concerns about how screen time might affect children’s health.

As children grow, their long bones, such as the femur, extend at their ends. These ends, called growth plates, eventually harden, stopping further growth in height. Girls typically reach their maximum height between ages 14 and 16, while boys stop growing between ages 16 and 18.

Recently, many studies have noted early puberty in both girls and boys, resulting in quicker initial growth but an earlier end to growth. Increased exposure to blue light may be a contributing factor.

Study Overview

Researchers from Gazi University in Turkey studied 36 rats, dividing them into three groups. One group experienced a normal light cycle, while others were exposed to blue light for six or twelve hours daily until signs of puberty appeared.

The rats exposed to blue light showed faster growth, especially in their bones, and began puberty earlier than those in standard light conditions. This study marks a significant step in understanding the effects of blue light on physical growth. Lead researcher Dr. Aylin Kılınç Uğurlu stated that further investigation into screen exposure effects on children is needed.

Potential Risks

Dr. Kılınç Uğurlu cautioned that results from this rat study may not directly apply to humans. However, the findings suggest that prolonged blue light exposure accelerates physical growth and maturation of bones, leading to early puberty.

While increased growth may seem positive, it can lead to premature changes in the bones’ growth plates. This early maturation might result in shorter adult height. The researchers aim to investigate how blue light exposure before puberty affects skeletal development in adult rats. They hope to determine whether certain exposure durations or intensities have lasting or reversible effects on growth.

This research may lead to guidelines for safe screen use during childhood development.

Meeting: 62nd Annual ESPE Meeting 2024