Quote:Today in the U.S., about 16 percent of girls enter puberty by the age of 7, and about 30 percent by the age of 8. A recent study determined that the number of girls entering puberty (defined by breast development) at these early ages has increased markedly between 1997 and 2010.[1]
The average age at menarche in Western countries began declining during the early part of the 20th century due to increased consumption of animal products and increasing calorie intake...
Taking all this data together, we can estimate that the normal, healthy age at menarche under conditions of excellent nutrition without caloric excess would probably fall somewhere between 15 and 18. But today in the U.S., about half of girls begin developing breasts before age 10, and the average age at menarche is less than 12 ½ and still declining.
...Several studies have found associations between higher childhood BMI and earlier puberty in girls. Excess body fat alters the levels of the hormones...Higher total protein, animal protein, and meat intake in children age 3-7 have been associated with earlier menarche in multiple studies. In contrast, higher vegetable protein intake at age 5-6 is associated with later menarche...Meat and dairy consumption in children may also reflect ingestion of environmental endocrine-disrupting chemicals (EDCs) that have accumulated in animal tissues...High dairy consumption is associated with earlier than average menarche...Soft drink consumption is associated with early menarche...Children's diets should focus on whole plant foods rather than animal foods -- this will keep protein intake in a safe range and reduce their consumption of EDCs...Minimize dairy products in children's diets -- use almond and hemp milks instead of cows' milk
from http://www.huffingtonpost.com/joel-fuhrm...57167.html