Milk is made from mammary glands which are actually modified sweat glands.
There was a study to compare human breast milk between various cultures and it found that the nutritional content of the milk did not vary much even between hunter-gatherer tribes and people living in a modern city. As long as the mother isn’t malnourished, the mammary glands will make the same balance of nutrients. The white color of milk comes from the suspended milk fat.
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