Cooking also destroys thiamine, so those who feed fresh but cooked food to their cats (and presumeably, ferrets) should add a thiamine supplement to it after cooking.
Thiamine is added to commercial cat foods.
Some fresh fish is also off limits, as is frozen fish, due to the thiaminase content (enzyme that destroys thiamine).
As has been pointed out, humans DO eat fruit, so we don't have to get all of our nutrients from meat. If we did, we would have to eat some of it fresh and raw, the way the Inuit and Sami peoples did.
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