Politicians are starting to tell us what food we should eat for our health. In the time of Noah there were few restrictions.
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.
Noah knew that certain animals were clean and acceptable to be used for a sacrifice, but there were no restrictions for food.
Gen 9:3 Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
This is a change, for in the beginning the food was to be vegetables and fruit for man and beast. The fall of Adam brought the killing of animal and the eating of meat. There were no restrictions as to the diet until the law of Moses. Mankind could kill and eat anything they wanted. After Jesus came and the new covenant the dietary restrictions were once again removed.
Peter had a vision that removed the dietary restrictions.
Acts 10:13 And there came a voice to him, Rise, Peter; kill, and eat.
Acts 10:14 But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean.
Acts 10:15 And the voice spake unto him again the second time, What God hath cleansed, that call not thou common.
Gen 9:4 But flesh with the life thereof, which is the blood thereof, shall ye not eat.
The blood is the life of the animal, it was not to be eaten. This prohibition continued in the New Testament.
Acts 15:28 For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things;
Acts 15:29 That ye abstain from meats offered to idols, and from blood, and from things strangled, and from fornication: from which if ye keep yourselves, ye shall do well. Fare ye well.
The shed blood was a picture of Jesus, who would have his blood shed for our sins.
Mat 26:28 For this is my blood of the new testament, which is shed for many for the remission of sins.
Let your conscience be your guide in choosing what to eat.
Rom 14:21 It is good neither to eat flesh, nor to drink wine, nor any thing whereby thy brother stumbleth, or is offended, or is made weak.
Rom 14:22 Hast thou faith? have it to thyself before God. Happy is he that condemneth not himself in that thing which he alloweth.
Rom 14:23 And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.