Exposure To Exogenous Estrogen Through Intake Of Commercial Milk Produced From Pregnant Cows

[Shanks]

Hello guys,

i found a study at Exposure to exogenous estrogen through intake of commercial milk produced from pregnant cows. - PubMed - NCBI

BACKGROUND:
Modern genetically improved dairy cows continue to lactate throughout almost the entire pregnancy. Therefore, recent commercial cow's milk contains large amounts of estrogens and progesterone. With regard to the exposure of prepubertal children to exogenous estrogens, the authors are particularly concerned about commercial milk produced from pregnant cows. The purpose of the present study was therefore to examine concentrations of serum and urine sex hormones after the intake of cow milk.

METHODS:
Subjects were seven men, six prepubertal children, and five women. The men and children drank 600 mL/m(2) of cow milk. Urine samples were collected 1 h before the milk intake and four times every hour after intake. In men the serum samples were obtained before and 15, 30, 45, 60, 90 and 120 min after milk intake. Women drank 500 mL of cow's milk every night for 21 days beginning on the first day of the second menstruation. In three successive menstrual cycles, the day of ovulation was examined using an ovulation checker.

RESULTS:
After the intake of cow milk, serum estrone (E1) and progesterone concentrations significantly increased, and serum luteinizing hormone, follicle-stimulating hormone and testosterone significantly decreased in men. Urine concentrations of E1, estradiol, estriol and pregnanediol significantly increased in all adults and children. In four out of five women, ovulation occurred during the milk intake, and the timing of ovulation was similar among the three menstrual cycles.

CONCLUSIONS:
The present data on men and children indicate that estrogens in milk were absorbed, and gonadotropin secretion was suppressed, followed by a decrease in testosterone secretion. Sexual maturation of prepubertal children could be affected by the ordinary intake of cow milk.

Any opinions?

 

[tca300]

I asked Ray about this study a while back and this was his response.

" I know lots of men who drink from two to four quarts of milk every day who have normal testosterone and estrogen. Maybe Japanese milk is different. " - Ray Peat

 

[jyb]

On a recent thread, someone posted a link showing dairy products were the worst foods for phtalate contamination. Those are highly estrogenic.

 

[CoolTweetPete]

If I recall correctly, the progesterone in the milk should oppose the estrogen. Don't know if that justifies it. I don't drink milk other than goat because it's easier on my stomach, and I suspect that the commercial production process isn't as invasive.