Why girls mature earlier than boys
Over the past 150 years, the average age at first menstruation in American girls has decreased by 3 years. First in 1969 and then in 1999, the norms for the age of puberty were revised downward, while the last time the norms for boys remained unchanged. As a result, in our time, the appearance of the first signs of puberty is considered normal in girls at the age of 10 ± 3, and in boys at 11 ± 2 years. At the same time, there is an acceleration of the physical development of children and adolescents. Why is puberty getting younger, and why is this trend more relevant for girls?
I am developing a hypothesis about the mechanism of influence of modern high-calorie nutrition on the timing of puberty with a predominant effect on the female sex. Also, this hypothesis answers the questions why in more well-nourished children, puberty is observed earlier, and with a lack of body weight and dwarfism, it is delayed.
In both animals and humans, the rate of onset of puberty positively depends on body weight even more than on age. That is, when a certain critical body weight is reached, the biosynthesis of sex hormones is unblocked, as a result of which puberty occurs. But how does the body calculate its own body weight and determine the moment of reaching a critical value, after which puberty starts?
In such a frame of reference, there must be a certain constant relative to which the growing body mass is a variable value. Considering that puberty in childhood is blocked by a high level of the hormone melatonin, it is advisable to look for a hypothetical constant in the gland synthesizing this hormone – in the pineal gland.Поділитися цим: