WHAT DID NOAH EAT?
Did Noah eat clean animals? The answer is that Noah did not eat *any* animals. Noah's diet was the same as Adam and Eve and the animals - they were vegetarians.
God to Adam and Eve and the animals...
Gen 1:29 And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat.
Gen 1:30 And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so.
NOAH DID NOT EAT ANIMALS ON THE ARK
To Noah and the animals on the ark...
Gen 6:21 And take thou unto thee of all food that is eaten, and thou shalt gather it to thee; and it shall be for food for thee, and for them. (THE SAME FOOD FOR BOTH] Noah was to gather "it" and the same *it* was food for Noah and the animals.
We know that Noah's diet was a vegan diet because it did not change until Gen 9:3 when God blessed Noah and said:
Gen 9:3 Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
Previously the food permitted by God, was the green herb - the change was to allow flesh food.
These facts cause one to wonder why did Noah distinguish between clean and unclean animals if he did not eat them? The answer is found in Genesis:
Gen 8:20 And Noah builded an altar unto the LORD; and took of every clean beast, and of every clean fowl, and offered burnt offerings on the altar.
The distinction between clean and unclean animals was for sacrifice - not diet since they did not eat animals.
There are many sincere torah keepers today who think that Noah ate only clean animals and assume that the clean and unclean diet existed before the Israelites were commanded to observe the clean and unclean laws in their covenant with God. The reality is that prior to Mt Sinai man was permitted to eat all animals - "every moving thing that liveth" which was a blessing from God.
1906 Jewish Encyclopedia http://www.jewishencyclopedia.com/articles/4408-clean-and-unclean-animals
The distinction between clean and unclean animals appears first in Gen. vii. 2-3, 8, where it is said that Noah took into the ark seven and seven, male and female, of all kinds of clean beasts and fowls, and two and two, male and female, of all kinds of beasts and fowls that are not clean. Again, Gen. viii. 20 says that after the flood Noah "took of every clean beast and of every clean fowl, and offered burnt offerings on the altar that he had built to the Lord." It seems that in the mind of this writer the distinction between clean and unclean animals was intended for sacrifices only; for in the following chapter he makes God say: "Everything that moveth shall be food for you" (Gen. ix. 3).