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In research studies, animals deficient in leptin did not undergo puberty, but puberty began when leptin was administered to the animals.Further, girls with higher concentrations of the hormone leptin are known to have an increased percentage of body fat and an earlier onset of puberty than girls with lower levels of leptin.
Genetic factors are likely involved in the timing of puberty, and the timing of puberty has often been described to "run in families." Additionally, a gene has been identified that appears to be critical for the normal development of puberty.Nutritional and other environmental influences may be responsible for this change.For example, the average age of the onset of menstrual periods in girls was 15 in 1900.Even though Lindsay suffers from the condition, friends like David give her the power to play and have fun like any other little girl.Those who wish to help Lindsay and others like her can donate here.In some African-American girls, puberty begins earlier, at about age 9, meaning that puberty occurs from ages 9 to 14.Adolescent girls reach puberty today at earlier ages than were ever recorded previously.A lot happens in reading over the course of kindergarten, so here's a handy guide to help you know where your child should be with reading skills at the beginning of the kindergarten year, as well as at the end.Providing facts about sexual abuse is one of the ways to raise awareness about sexual abuse.By the 1990s, this average had dropped to 12 and a half years of age."Secondary sex changes" are those physical changes associated with the progressive rise in sex hormones -- estrogen and progesterone in females and testosterone in males.