Nutrition Facts with Dr. Greger

The Side Effects of Hormones in Dairy

8 snips
Feb 5, 2026
They investigate hormones in milk and how dairy becomes a concentrated source of estrogens and progesterone. Studies showing rapid hormone changes after drinking milk and links to acne, prostate and endometrial cancer are discussed. Research connecting dairy intake to altered female reproductive function and potential contaminant mechanisms is highlighted.
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INSIGHT

Milk Quickly Alters Human Hormones

  • Drinking cow's milk can raise human estrogen levels and lower testosterone within an hour in men and children.
  • Michael Greger cites studies showing estradiol and other pregnancy estrogens spike after consuming a quart of milk.
ANECDOTE

Twin Rates And A Quart-Of-Milk Test

  • Milk drinkers have five times the rate of having twins compared to vegans, suggesting dairy's hormonal effects.
  • Researchers tested men and children drinking a quart of milk and measured immediate hormonal shifts.
ADVICE

Limit Large Servings Of Cow's Milk

  • Be cautious about consuming large volumes of cow's milk, especially for men and children, due to measurable hormonal effects.
  • Consider plant-based alternatives if concerned about ingesting animal estrogens and growth factors.
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