have been extended and refined. Modern Jewish thinkers and movements vary in the degree to which they advocate the observance of kashrut. Some have tried to blend it with such contemporary concerns as vegetarianism and environmentalism.
Food from animal sources is subject to many conditions. Only certain species of mammals and birds are kosher, and then only if slaughtered in a particular fashion and found healthy upon inspection. The prohibition on consuming blood requires that meat be salted and soaked. Fish with fins and scales are kosher, and their flesh requires no such special treatment.
Today, Jews who observe kashrut rely on recognized supervision agencies whose symbols on packaged foods or whose certificates in shops and restaurants testify to the acceptability of the food within.
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