We just read a 2010 study in Biology last semester. The hormones in milk/meat is a MYTH. Each girl is given a hormonal time frame from her mother which will determine when she starts her period/begins puberty. The only thing that upsets that is if her body fat percentage reaches a certain point--then it can result in early puberty. We have obese children and girls are starting earlier because of it.
What can we do about it? Well, we've been down the whole obesity-epidemic lane, so I won't reiterate that. But we educate our girls early. We make sure to tell them what a period is, what breasts are, how babies are made--EARLY. Like, if your child is in public school (even kindergarten) and doesn't have a watered-down, age-appropriate version of what will happen to her body/where babies are made, it's time to do it.
We buy our girls BRAS when their nipples poke out of their shirts, even if it seems "too early" to buy them a bra. I was wearing underwire cups in fourth grade because of my 34C knockers. You just gotta do it.
We educate girls about their bodies, and about proper period hygiene. We don't scare them about tampons, like the poor girl who lived up the street from me growing up. (I showed her how to use a tampon in seventh grade; she repented to the Bishop for losing her virginity; her mother yelled at me, screaming, "I didn't want her to know there was a hole there until she was married!" WTF?)
I think, too, we educate our boys about the changes both boys and girls will go through. I'll never forget when I was in eighth grade and leaked through my pants: the boy sitting behind me jumped up when the bell rang, pulled off his jacket, wrapped it around me, and whispered, "You're leaking. You should go see the nurse." That was it. Simple, no teasing. I sent him and his mother a thank you card, because I would have walked down the whole hall with bloody khaki pants if it wasn't for him.
We're just bigger as people in general, so even if you don't have an overweight daughter, she could still start earlier. When your body fat percentage reaches a certain proportion, you are technically ready to make babies--you have enough fat in your system to sustain another life in your womb. I repeat, the hormones in milk/eggs/meat is NOT the culprit.
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