Know your supplier. I know that meat isn't the greatest when healing the unhealable is of utmost importance. The diets with the greatest track records do not incorporate meat in any form.
With a system that is stonger, some meat can be tolerated. Everyone's balance point is different and one needs to listen to his/her body in this regard. Protein is beneficial in some cases but hemp protien or other plant proteins are much easier assimilated than animal protein.
One of the biggest problems with comercial meat is the growth hormones, Antibiotics , and perservatives that permeate these foods.