Dairy
From Biohacking Wiki
How To Choose Good Quality Dairy
The Cornucopia Institute Organic Dairy Scorecard
Potential Health Risks
Estrogen
Most of our milk comes from pregnant cows, even with grass-fed organic dairies. Pregnant cows's milk can have estrogen levels of up to 33 times that of non-pregnant cows. These cows typically birth one calf / year, and get two months off of milking before said birth, giving 7 months worth of pregnant / high estrogen milk.
Raises serum and urine estrogen, lowers testosterone [1]
One study found:
- 24-54 ng (nanograms) per day for cow milk drinkers (based on 3/4 cup milk/day)
- 10 ng per day for goat milk drinkers (based on 3/4 cup milk/day) [2]
Goat's Milk
Goat's have a 5-month gestation period but also a 2-month break from milking, leading to a much higher percentage of the year without elevated estrogen levels.