Check out the laws of Kashrut (Kosher foods).
It teaches people not to eat omnivores or carnivores; to wash food; and to oversee food production. As we now know, this regulation helped early semitic cultures avoid food-borne illnesses, especially those found in predatory animals.
Through a couple thousand years, these theistic laws were formed off of trial-and-error. They didn’t understand *why* staying Kosher was healthier–it just was.
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