Genesis 9:3

Every moving thing Which is wholesome and fit for food, shall be meat for you: That liveth This may be added to exclude the use of those creatures which died of themselves, or were killed by wild beasts. These, which were afterward expressly forbidden to be eaten, (see Exodus 22:31; Leviticus 22:8,) may here be forbidden implicitly. Hitherto man had been confined to feed only upon the products of the earth, fruits, herbs, and roots, and all sorts of corn and milk; such was the first grant, Genesis 1:29. But the flood having perhaps washed away much of the virtue of the earth, and so rendered its fruits less pleasing, and less nourishing, God now enlarged the grant, and allowed man to eat flesh, which perhaps man himself never thought of till now. The Jewish doctors speak so often of the seven precepts of Noah, which they say were to be observed by all nations, that it may not be amiss to set them down here.

The first was against the worship of idols: the second against blasphemy; and requires to bless the name of God: the third against murder: the fourth against incest and all uncleanness: the fifth against theft and rapine: the sixth required the administration of justice: the seventh was against eating flesh with life. The Jews required the observation of these from the proselytes of the gate. But the precepts here given, all concern the life of man. Man must not prejudice his own life by eating that food which is unwholesome and prejudicial to his health.