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A comment on In Raising the World’s I.Q., the Secret’s in the Salt (2006). Parent comment
It's possible this has some contribution, but it's not the main source.
> It's not inherent in the dairy itself
Yes, it is; in cows (and humans) mother's milk is where young who aren't eating anything else get their iodine.
> otherwise we could just eat the cow's grass to obtain iodine
Well, except for the fact that grass doesn't work well in the human digestive system, and you'd have to eat a lot of it, sure.
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It's possible this has some contribution, but it's not the main source.
> It's not inherent in the dairy itself
Yes, it is; in cows (and humans) mother's milk is where young who aren't eating anything else get their iodine.
> otherwise we could just eat the cow's grass to obtain iodine
Well, except for the fact that grass doesn't work well in the human digestive system, and you'd have to eat a lot of it, sure.