The drop in the average age at which girls show secondary sex characteristics such as breast buds and pubic hair can be attributed to

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Studies have shown that the drop in the average age of showing secondary sex characteristics in girls is largely due to increased rates of obesity. Obesity results in increased levels of estrogen, which can lead to earlier onset of puberty. Furthermore, adipose tissue can also increase the conversion of androgens to estrogen, promoting breast development and pubic hair growth. Increased protein intake, exercise, and improved nutrition can certainly have positive effects on overall health, but do not have a clear correlation with the earlier onset of puberty.

The Drop in the Average Age at Which Girls Show