High meat diet may lead to early puberty for girls

Jun 11, 2010
High meat diet may lead to early puberty for girls

(PhysOrg.com) -- Increased amounts of meat in children's diets may be part of the reason why girls go through puberty at a much younger age than they did 100 years ago, new research using the Children of the 90s cohort shows.

With evidence suggesting that girls who start their periods early are at higher risk of developing cancer and heart disease, scientists involved in the study said their results added to evidence that it was healthier to avoid high-meat diets.

The research, led by Dr Imogen Rogers from the University of Brighton, involved a study of 3,000 girls taking part in the University of Bristol's Children of the 90s study.

Dr Rogers, working together with colleagues at the University of Bristol including Professor Andy Ness, looked at the girls' at the ages of three and seven years and how likely they were to have started their periods by the time they attended a research clinic aged around 12½ years.

They found that girls who had a higher intake of meat and protein at three and seven were more likely to have started their periods by 12½ years old than girls who ate less meat and protein.

Their report found 49 per cent of girls eating more than 12 portions of meat a week at the age of seven had started their periods by age 12 ½, compared to only 35 per cent of those who ate less than four portions of meat a week.

Dr Rogers, a senior lecturer at the University of Brighton's School of Pharmacy and Biomolecular Sciences, said there was evidence that girls who start their periods early were at higher risk of a number of diseases including , and . This work suggests that a girl's diet in early childhood may affect her risk of suffering from these diseases as an adult.

Dr Rogers said: “Meat is a good source of many important nutrients including iron and zinc and there is no reason why girls should adopt a vegetarian diet or that meat in moderation cannot form a valuable part of a for children.”

She said the findings needed repeating in other populations before firm recommendations on diet can be made but she added: “These results add to the evidence that it is healthiest to avoid diets containing very high amounts of .”

The research, funded by the World Cancer Research Fund, has just been published in the journal Public Health Nutrition.

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User comments : 37

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lengould100
5 / 5 (6) Jun 11, 2010
It might be interesting to see this study repeated after controlling for things like growth hormones used in raising the meat eaten.
Skeptic_Heretic
5 / 5 (6) Jun 11, 2010
It might be interesting to see this study repeated after controlling for things like growth hormones used in raising the meat eaten.

Being well fed typically leads to faster maturation. Our bodies produce more growth hormone than we can use, getting more from our food doesn't affect us in any significant way. Multiple studies have confirmed this with double blind controls both in the lab on animals and int he real world with people.

Hormones in food do not significantly alter the human body, but the presence of adequate nutrition will result in taller, stronger, faster-maturing humans in much the same way a well fed plant grows more robustly than a poorly fed plant.

The hormone thing has been debunked, but it's still a commonly held misconception.
PinkElephant
5 / 5 (1) Jun 11, 2010
Our bodies produce more growth hormone than we can use
Would this also not be true of cattle? Yet, why are they injected with growth hormones, then?
The hormone thing has been debunked, but it's still a commonly held misconception.
Are you so sure? Growth hormones are one thing, but cattle are also injected with steroids and other crap to boost their muscle mass and growth rates. Steroids are well-known to affect humans in rather unpleasant ways, like causing females to e.g. exhibit certain male traits (like deepening voice, increased body hair), while evincing feminizing changes in males (like shrunk testicles, breast tissue growth.)
Djincs
2 / 5 (3) Jun 11, 2010
The think that doesnt make sence is that the affected are the girls, then estrogen should be the culprit, if testosterone(or other sinthetic molecule with the same effect) is present in the food the boys should be affected, this is posible actually , testosterone and all the steroid hormones are soluble in lipids and they are well absorbed in the intestines, for example you cant eat the insulin...it will break because it is peptid.
Djincs
1 / 5 (2) Jun 11, 2010
Still boys dont have something like period, and it is harder to find which mature earlier.
And i dont know wheter they use the testicals of the animals when they are doing sosigies, they have more testosterone because they are produsing it.
ArtflDgr
1.5 / 5 (2) Jun 11, 2010
Biological father absence results in early onset..

its been known for a long time...

but its not acceptable to the ideology, so everything else has to be touted...

meanwhile, it even fits evolutionary models in which early fertility would save a girl child whose father was killed and mother took new mate, from ending up as the young males did. dead.

the fact that feminism has changes demographics and since that time more and more girls grow up in homes without fathers (step father wont do, wrong MHCs), the more that increases, the earlier the onset for the whole.

to think that fathers are just natures wallets belies a lack of understanding of darwin. any force that changes the life dynamic and is maintained for a long time, gets plumbed for advantage, and adaptation.

traditional families in graves have been found now from the earliest times of mans habitations... where primal mating demanded even more selection than today.

you can find it if you look...
but who looks?
Djincs
2.3 / 5 (3) Jun 11, 2010
Ok and you are saying that girls with no fathers are eathing more meat? because the stidy has selected the two groops acording to this factor, any other factors are random, the number of the girls with no father are equal(or near to equal) in the both grups!
PinkElephant
5 / 5 (1) Jun 11, 2010
@ArtflDgr,
but its not acceptable to the ideology, so everything else has to be touted...
What does that have to do with:

"Their report found 49 per cent of girls eating more than 12 portions of meat a week at the age of seven had started their periods by age 12 ½, compared to only 35 per cent of those who ate less than four portions of meat a week."
otto1923
5 / 5 (3) Jun 11, 2010
meanwhile, it even fits evolutionary models in which early fertility would save a girl child whose father was killed and mother took new mate, from ending up as the young males did. dead.
One might also conclude that the absence of adequate nutrition would indicate that a population had grown to capacity, and delaying puberty would be a way of slowing growth.

As the traditional age of marriage has been 13 throughout most of history in most cultures, I wonder if this theory of early maturity is not another reproduction-related myth? Women were betrothed as soon as they were able to conceive for a number of very good reasons. And there is much cultural pressure today to postpone or prevent reproduction in order to slow pop growth, no matter what we've been led to believe.
otto1923
5 / 5 (2) Jun 11, 2010
Conversely, as SH pointed out, excess food would cause earlier onset of puberty. Overfed females would tend to develop the ability to conceive earlier, and I understand this is the case. Plenty of meat, lots of game, and pops could grow faster. Reverting to roots and grass would indicate overcrowding and puberty would come later.
Skepticus
4 / 5 (1) Jun 11, 2010
I see a recipe for social instability. Well-fed girls (and boys) mature fast and becoming physically adults essentially; while social pressures, norms and morals hold them back in "children" status. No wonder some of them ran amok and contribute to an increasing teen violence rate.
Caliban
3 / 5 (2) Jun 11, 2010
I'm just happy to point out that no one went after the title of the article. (sigh) Our little community is growing up...
Skeptic_Heretic
not rated yet Jun 12, 2010
Our bodies produce more growth hormone than we can use
Would this also not be true of cattle? Yet, why are they injected with growth hormones, then?
Cattle are quite a bit different due to how heavily we've messed with their metabolism in demoestication.
Are you so sure? Growth hormones are one thing, but cattle are also injected with steroids and other crap to boost their muscle mass and growth rates. Steroids are well-known to affect humans in rather unpleasant ways, like causing females to e.g. exhibit certain male traits (like deepening voice, increased body hair), while evincing feminizing changes in males (like shrunk testicles, breast tissue growth.)

Steroids are a very different thing. In order for steroids to work you must metabolize them. Once they're metabolized by the cattle you cannot re-metabolize them by eating the Cattle. For the most part there are strict controls on steroid use leading up to slaughter because of this fact.
Djincs
1 / 5 (2) Jun 12, 2010
@ Skeptic
here I have different opinion again, I am not mean I just have...
This steroids work when they are not metabolised, when you metabolise them they are inactive, in order for steroids to work they shoud be given regularly, in the food lets say, the blood levels of active steriod is high, and when you eat the meat you absorb it and then you inactivate it, but still there is some effect on you, at least this is the theory.
Skeptic_Heretic
not rated yet Jun 12, 2010
at least this is the theory.
No, this is your theory. If you don't metabolize something your body does not use it. This is very basic human biology.
Djincs
1 / 5 (2) Jun 12, 2010
Man, man , man, man...
If you drink a solution of glucose what will happen, you will use it imediately, I am pharmacist, the magority of the pills are active as they are, and when you metabolyse them they can deactivate, to turn more potent , to become toxic and so on.....
Skeptic_Heretic
not rated yet Jun 12, 2010
Then you're a really bad pharmacist.

Steroids depending on type, function by filling receptor slots within your body's various systems, this is the process of metabolization. Use and subsequent biological breakdown. If your cells don't use it, then it doesn't get metabolized.

And selling viagra via spam mails is not pharmacology.
Djincs
3 / 5 (2) Jun 12, 2010
Ahahaha
woww Skeptic you are sick man, thats all I have to say, I dont want to argue with you, it is pointles,
I am sorry but you are unmature....grow up!
Djincs
3 / 5 (2) Jun 12, 2010
And abouth metabolism, you are not even close, first you go wrong when you were talking about metabolism is necesarry to use something, this is called digestion, and hormones acts in receptors which are different from the enzime in the liver that inactivate them!!!!there is BIG difference between action and metabolization!!!
otto1923
4 / 5 (1) Jun 12, 2010
I see a recipe for social instability. Well-fed girls (and boys) mature fast and becoming physically adults essentially; while social pressures, norms and morals hold them back in "children" status. No wonder some of them ran amok and contribute to an increasing teen violence rate.
Yeah, a nasty formula indeed. But an absolutely essential one. Domestication is the process of teaching the willful denial of natural tendencies, and the recognition of them as errant, pathological, criminal. Those who cannot comply can be identified, restricted, isolated to various degrees and removed from the populace, one way or another; culled. Society becomes more stable as a result. 'The meek shall inherit the earth' was a promise and a Design goal.

Civilization cannot function without effective domestication. Civilization itself is a supremely unnatural phenomenon.
Djincs
5 / 5 (2) Jun 12, 2010
Yeahh keep ranking me 1, this will do the job!
in7x
5 / 5 (1) Jun 12, 2010
In other news, "Early puberty may lead to a high meat diet for girls".
Skeptic_Heretic
not rated yet Jun 12, 2010
Ahahaha
woww Skeptic you are sick man, thats all I have to say, I dont want to argue with you, it is pointles,
I am sorry but you are unmature....grow up!

Ad hominem because you've been caught in a lie. Sorry friend, claiming false knowledge will always result in sound refutation on this site.
Djincs
1 / 5 (1) Jun 12, 2010
Falce knowledge, then physorg have to ban you posting comments!
"If your cells don't use it, then it doesn't get metabolized."
You are making things really simple it is much more complicated than that.
when you take a drug it cant act upon receptors, and then to leave the body unmetabolised, it can be metabolised but from enzime in tissue that is completely different from the tissue on which it acts.
Your arrogance just amaze me!
And in parts makes me laugh!
Skeptic_Heretic
not rated yet Jun 12, 2010
Then define metabolism and show me where I'm incorrect.
Djincs
not rated yet Jun 12, 2010
it is biotransformation of the exogen substance, you have 2 stages of metabolism, furst-oxigenation, reductation, hidratation, hidrolisation and so on, you have, this is happening primarilly in the liver, by family of enzimes CYP P450 (they are in the intestines too, lungs, kidneys and other parts)
Stage two metabolisation-glucuronidation, acetilation, sulfatation and so on and so on, stage two is again in the liver...wheter drugs acts in all of the human parts- lets say brain(benzodiazepines, antidepresants and so on)but they dont get metabolized there...
ironjustice
not rated yet Jun 12, 2010
The problem is the iron in the meat. We began using REFRIGERATION and NOW we eat alot more meat than we did BEFORE refrigeration. This is shown by those people who found Metformin reduces precocious puberty. The 'coincidental' thing here is the FACT metformin ALSO lowers iron. So reverse engineering says .. "if metformin lowers iron and iron is considered to BE a CAUSE of precocious puberty then the study of metformin lowering precocious puberty tells us the iron very possibly causes precocious puberty" ..
Pretty simple really ..
Imho ..
Skeptic_Heretic
not rated yet Jun 12, 2010
Despite their relatively simple chemical structure, steroids occur in a wide variety of biologically active forms. This variety is not only due to the large range of compounds secreted by steroid-synthesizing tissues, but also to the fact that circulating steroids are extensively metabolised peripherally, notably in the liver, and in their target tissues, where conversion to an active form is sometimes required before they can elicit their biological responses.

From: http://www.gfmer....ism.html

Metabolism occurs in the receptive tissues in addition to the liver, it is how steroids work. Back to school with you, sir. The uptake and expression of chemical function as provided for by a steroid or other hormone is post metabolism. Without actually receiving the steroid (the first step of metabolism) there is no functional expression. Metabolism is required for functionality. The post metabolites won't have discernable effect.
ironjustice
not rated yet Jun 12, 2010
The problem is the iron in the meat. We began using REFRIGERATION and NOW we eat alot more meat than we did BEFORE refrigeration. This is shown by those people who found Metformin reduces precocious puberty. The 'coincidental' thing here is the FACT metformin ALSO lowers iron. So reverse engineering says .. "if metformin lowers iron and iron is considered to BE a CAUSE of precocious puberty then the study of metformin lowering precocious puberty tells us the iron very possibly causes precocious puberty" ..
Pretty simple really ..
Imho ..
Djincs
not rated yet Jun 12, 2010
yes great link here what it says:
"The main site of peripheral steroid inactivation and catabolism is the liver, but some catabolic activity also occurs in the kidneys. Inactive hormones are mainly eliminated as urinary (mostly conjugated) metabolites."
For each molekule it is different, you cant make statement like these, there are lots of steroids which are sintetically obtained and they are active without metabolization.
Skeptic_Heretic
not rated yet Jun 12, 2010
synthetic hormones must be metabolized to have a function. Synthetic simply means they manufactured as opposed to withdrawn from a physical/biological system, like donated blood.
Djincs
not rated yet Jun 12, 2010
No thats how you can obtain testosterone, trere are sinthetic steroids which you cant find in the living organism, they are new for the body and often are more effective than the endogenic substances, due to less methabolisation, stronger bingind with the receptors and others....Oxymetholone is more efective than testosterone for example.
Djincs
not rated yet Jun 12, 2010
What I do actually is trying and my english sux i know, I dont use it often sorry...
ArtflDgr
1 / 5 (2) Jun 20, 2010
What does that have to do with:

"Their report found 49 per cent of girls eating more than 12 portions of meat a week at the age of seven had started their periods by age 12 ½, compared to only 35 per cent of those who ate less than four portions of meat a week."

easy if an answer is not allowed, since the cause is father absence, and father absence is desired (as a STATED result of their cause), then of course they will attempt to tie it to anything but what it is.

the same is true of perimenopause, which starts in early 20s.. but tell women following the new have babies too late plan (birth control), dont know that their best fertility time has passed due to politics.

ArtflDgr
1 / 5 (1) Jun 20, 2010
Ok and you are saying that girls with no fathers are eathing more meat?

no.. did you read the MHC part and know what it meant. or did you see it, think its pretty letters and ignore it rather than look it up?

just as women select men with different mhc signals over those with the same when they are fertile... females as children can also smell their parents, and so a child who does not smell the mhc signal of dad, biologically knows dad is gone, and her body changes to suit the living condition change.

praeder willi is mitigated by father presence (meaning if dad is around the kids use energy different)

and same is true of menses.

the science done recently reminds me of ht stories of the work done in my old country. soviet union.
TygerFish
not rated yet Jun 20, 2010
What precludes the possibility that girls who are biologically predisposed towards early puberty are more likely to want to eat meat?
PinkElephant
5 / 5 (1) Jun 20, 2010
@ArtflDgr,
Biological father absence results in early onset..
Provide a link to or citation of an epidemiological study demonstrating this. Unless and until you do, all of your arguments on the topic are nothing but an untested hypothesis.

Am I to understand your contention with regard to the above-described study is, that the statistically significant correlation of early puberty onset with high meat consumption is nothing but a highly unlikely coincidence?

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