Most nutrition advice lumps all meats into the same category, especially red meats. That is a mistake. Like carbs, meats should be divided into the two groups of “factory processed meats” (lunchmeats, salami, pepperoni, prepared patties and so on), which are ruined both by processing methods and by additives, and unprocessed whole meats.
Quality proteins include (this is not an exhaustive list):
FARM ANIMALS
Beef
Pork
Mutton
GAME ANIMALS
Venison
Bear
Elk
PLANTS
Quinoa
Purslane
Spelt
Tofu
SEAFOOD
Sea Bass
Salmon
Cod
Trout
Halibut
Tilapia
Shrimp
Crab
Lobster
FOWL
Chicken
Turkey
Quail
Pheasant
Duck
A serving size of protein is 6 ounces raw EXCEPT grains, which are 1/2 cup cooked or Purslane, which is 3 cups raw.
There is no need to choose lean meats. The natural fats on cuts of meat are not only healthful, they are essential! However added fats should be avoided. In the case of ground meats it is usually best to select the cuts you want and have them ground, avoiding pre-packaged ground meats.