Because of better nutrition, the age at which girls reach menarche in the Unites States is older now than in previous decades.

Name: Because of better nutrition, the age at which girls reach menarche in the Unites States is older now than in previous decades.
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The age at which U. S. girls reach menarche has been decreasing, which is called the secular trend. Most researchers believe that better nutrition is at least partly responsible for this trend toward earlier sexual maturation.

Because of Better Nutrition, the Age at Which Girls Reach