Three Harvard studies linking acne with dairy consumption in adolescent girls and boys blamed the sex steroid hormone content naturally found in cow’s milk (even without added hormones), particularly skim.
Image thanks to killthebird
The Harvard Nurses study, published in the prestigious Journal of the American Academy of Dermatology, funded in part by none other than the National Dairy Council itself, found that the association between milk intake during adolescence and severe physician-diagnosed teenage acne was even more marked for skim milk than for other forms of milk…
This may be because there is so much more estrogen in skim milk. Researchers found 15 steroid sex hormones in commercial milk right off the shelves, and the highest levels were found in skim milk, compared to 2% and whole.
This study involved asking women what they ate years ago in high school, though—who can even remember?
So the next year Harvard researchers studied milk consumption and acne in adolescent girls directly, following 6000 girls, aged 9-15 for a few years and found the same darn thing: a positive link between intake of milk and acne. Maybe it’s just girls, though?
So next they studied milk consumption and acne in teenaged boys, and here we go again: a positive association between intake of skim milk and acne.
And it doesn't appear to be an issue with bovine growth hormone injections or added steroids. This is just what milk contains naturally. It should surprise no one that milk contains such a heavy complement of growth-enhancing hormones. Milk is, after all, specifically designed to make things grow.
To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring watch the above video. This is just an approximation of the audio contributed by veganmontreal.
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Make sure to see yesterday's video and Monday's final installment in this 3-part video series on the latest science on milk as a risk factor for acne development. I've previously covered this topic in my video Dairy Hormonal Interference. And there are hundreds of other videos on more than a thousand subjects here at NutritionFacts.org.