In traditional communities, even back in India, consanguineous marriage (couple who have common grand-parent(s)) has caused so much birth-defects in babies. While I appreciated the close-to-earth living style of the Amish, I am in no way appreciating or evaluating their intra-marriage style.
Life-style/stress diseases such as diabetes, heart-disease, cancer etc.. should be historically low in such communities. But genetic defects might be high.
One interesting point to ponder is, Whether consanguinity was/is always part of Traditional societies? And if so, are traditional societies completely wrong and un-natural since consanguinity actually doesn't make any evolutionary sense.
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