Quoted:
Gen. 1 chapter 29,30
And god said, See, I have given you every herb that yields seed which is on the face of the earth, and every tree whose fruit yields seed; to you it shall be for food.
Also, to every beast of the earth, to every bird of the air, and to everything that creeps on the earth, in which there is life, I have given every green herb for food; and it was so.
Of course in Gen 9:3 he told Noah different and basically said eat everything but my point without totally thread jacking is eating as close to the original diet is probably not an unhealthy way to start and then adding in meats etc. in moderation. My guess is our food supply these days isn't as healthy as it was back in the beginning. ymmv
Actually yes and no. Its much more complicated than that, if read into biblical history they did not eat great deals of meat on a regular basis and took in vegetable proteins with small amounts of meats. A lot of it was due to the fact that they simply had no practical means of preserving and storing large amounts of meats.
Also what you will find interesting if you read into it further is that you essentially were not supposed to eat pork even though it had a split hoof.
Lev. 11:3 "Whatever divides a hoof, thus making split hoofs, and chews the cud, among the animals, that you may eat."
Even though the pig has a split hoof did not chew a cud.
Lev. 11:7, "and the pig, for though it divides the hoof, thus making a split hoof, it does not chew cud, it is unclean to you."
There is a lot of scientific study to support this. Pork is not as healthy as other types of meat such as beef, goat, poultry. Also another thing to consider is that there was a biblical prohibition against eating shellfish as well and this has been largely proven to be unhealthy through scientific study that large amounts of shell fish is bad for you.
Lev. 11:9 “These you may eat, of all that are in the waters. Everything in the waters that has fins and scales, whether in the seas or in the rivers, you may eat."
Lev. 11:10 "But anything in the seas or the rivers that has not fins and scales, of the swarming creatures in the waters and of the living creatures that are in the waters, is detestable to you."
ETA concerning the fact that people of biblical times ate higher quantities of grains , it was the type of grains they ate. A good example is
Ezekiel 4:9 "Now go and get some wheat, barley, beans, lentils, millet, and emmer wheat, and mix them together in a storage jar. Use them to make bread for yourself during the 390 days you will be lying on your side."
These grains are so high in complex carbohydrates and proteins you can live on them almost exclusively. In fact there is a cereal made and sold called Ezekiel that is made from these grains and it has more protein in it that eating a steak. I have it for breakfast a lot of times and you are full when you are done. I highly recommend it.