Drinking Milk Decreases Testosterone and Increases Estrogen

MilkIf you are into bodybuilding you will have stumbled upon this idea that milk is bad for your testosterone. Testosterone is required to be able to build on a substantial amount of muscle, so it makes sense to increase, or at least prevent testosterone from decreasing. What does the science have to say, regarding milk increasing estrogen and reducing testosterone?

It has been demonstrated in several studies that mammalian estrogen is present in milk123, it should therefore be no surprise that this exogenous estrogen may cause adverse effects on us humans if consumed.

According to a study4 done in 2009, drinking commercially available milk which comes from pregnant cows increases serum estrogen and decreases serum testosterone significantly in humans. Ok, so we know that milk from pregnant dairy cows is bad for our hormones, but dairy cows aren’t constantly pregnant, or are they? Well, in the dairy industry the dairy cows must have at least one calf a year to ensure maximum milk production, therefore diary cows are the majority of the time pregnant567.

According to another study8 done in 2010, dairy consumption directly correlates to reduced reproductive hormone levels and is detrimental to semen quality in young men.

Conclusion

Evidently, it is a good idea to eliminate, or at least limit, the amount of dairy you consume, especially if you are into bodybuilding.

References

1.
Pape-Zambito D, Roberts R, Kensinger R. Estrone and 17beta-estradiol concentrations in pasteurized-homogenized milk and commercial dairy products. J Dairy Sci. 2010;93(6):2533-2540. [PubMed]
2.
Monk E, Erb R, Mollett T. Relationships between immunoreactive estrone and estradiol in milk, blood, and urine of dairy cows. J Dairy Sci. 1975;58(1):34-40. [PubMed]
3.
Qin L, Wang P, Kaneko T, Hoshi K, Sato A. Estrogen: one of the risk factors in milk for prostate cancer. Med Hypotheses. 2004;62(1):133-142. [PubMed]
4.
Maruyama K, Oshima T, Ohyama K. Exposure to exogenous estrogen through intake of commercial milk produced from pregnant cows. Pediatr Int. 2010;52(1):33-38. [PubMed]
5.
Life Cycle and Lactation Cycle of Dairy Cows. Vet in Training: Veterinary Disease Information Blog. https://vetstudentresearch.blogspot.de/2015/06/life-cycle-and-lactation-cycle-of-dairy.html. Accessed May 28, 2017.
6.
Managing the Transition Cow – Dairy Cattle. Dairy Cattle: Illinois Livestock Trail. http://livestocktrail.illinois.edu/dairynet/paperDisplay.cfm?ContentID=548. Accessed May 28, 2017. [Source]
7.
Managing Cow Lactation Cycles. The Cattle Site. http://www.thecattlesite.com/articles/4248/managing-cow-lactation-cycles/. Accessed May 28, 2017.
8.
Afeiche M, Williams P, Mendiola J, et al. Dairy food intake in relation to semen quality and reproductive hormone levels among physically active young men. Hum Reprod. 2013;28(8):2265-2275. [PubMed]

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