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Researchers found that exposure to the blue light from a smart device altered the hormone levels in female rats

We have found that blue light exposure, sufficient to alter melatonin levels, is also able to alter reproductive hormone levels and cause earlier puberty onset in our rat model. In addition, the longer the exposure, the earlier the onset,” saysendocrinologist and lead author Aylin Kilinç Uğurlu from Gazi University.

https://www.sciencealert.com/early-puberty-in-girls-surged-in-the-pandemic-and-we-may-finally-know-why

Now you may not care about the hormone level in rats. But this suggests that mammals like us are susceptible to significant hormonal effects from our phones

The researchers were seeking to find out why girls worldwide were reaching puberty worldwide at an earlier age. The rats exposed to the blue light seemed to mature faster than the other rats

This then raises questions such as does this apply to human beings? What other effects does the hormone change result in?