Why are girls starting puberty earlier?

New study suggests obesity could be linked to breast tissue development

School girls
(Image credit: Jeff J Mitchell/Getty Images)

A global study has found that by 2013 girls were starting puberty almost a year earlier on average than they did in 1977.

Co-author Dr Alexander Busch, who is based in Denmark, believes it is the first study to draw together global data on the development of glandular breast tissue, known as thelarche, says The Guardian.

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