Did you know that 75% of the global human population is lactose intolerant? The distribution varies widely and depends on genetics, with about 25% of the U.S. population lactose intolerant. —
Lactose intolerance is not a disorder, in fact it’s perfectly natural! For most adults, there is a dramatic reduction of lactase activity after infancy. This is a genetically programmed event, as lactase’s only role is helping us to digest the lactose sugar, found exclusively in milk.
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Humans are adaptable, however, and 25% of us that do digest milk well display “lactase persistence”. But this is clearly not the norm!
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My stance on dairy is: If you’re not sensitive to it, grass-fed full-fat fermented dairy or butter is ok because of the presence of unique nutrients such as CLA and vitamin K2.
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There is some interesting thinking regarding casein and A1 vs. A2 cows… Most dairy today comes from A1 cows. Its speculated that this genotype produces a form of casein that is more inflammatory
I think the jury is still out on that as the evidence is pretty weak all around, but goat milk is a way of bypassing this fact altogether. Plus it is a source of natural MCTs, or medium chain triglycerides. Nonetheless, A2 milk and goat milk still both contain lactose.
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Reference – https://www.ncbi.nlm.nih.gov/pubmed/10096780