Hello everyone, I am wondering why the paleolithic diet, in many cases, promotes lean meats over fater alternatives. Hasn??t the research that been made on our evolution proven that hunter-gatherers consumed all bits and pieces of the animal. From brain and eyes to different organs, aswell as leaner parts.
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Fattier cuts of grassfed/organic meats, leaner cuts of conventional meats. High fat organ meats are also popular.
I think there's two (major) reasons you see mention of 'lean meats'. First, it's more compatible with mainstream nutrition. Second, Cordain based his paleo framework off of the idea that game meat is extra lean. It is leaner than what you get from a farmer.
While grassfed is optimal, we can't all afford it (or have access to it) on a regular basis -- nutritionally speaking the good Omegas to bad Omegas ratio is an important part of the equation. How the animals are treated, dosed with chemicals and slaughtered is also important to a lot of people.
That said, the bulk of my own consumed meats are commercial/grain fed. I make up for it in various ways -- my favorite is to use grassfed beef bones for my perpetual bone broth, save the fats from broth rendering and cook my meats and vegetables in that.
It's not just the Omega balance in grain-fed meats. Hormones and antibiotics are given to make livestock more feed-efficient. These chemicals are carried through the fats of the meat. Eat them and you become more feed-efficient. That is to say, you will gain more weight with less feed.
That is why I prefer lean if I'm eating industrially farmed meats.
Fat intake, like carbohydrate intake, I believe, is meant to be cyclical. If a large amount of carbohydrate or fat was found, it was devoured. This might mean massive quantities, far more than most eat in a single sitting or even single day today.
With that said, it might not come along but a few times a month. Therefore, unlike today, where we have access to pounds of butter, coconut oil, lard and other fattier cuts of meat, it's probably smart to kind of stick to a cycle. This is one reason I think our ancestors were very metabolically flexible, which gave them a distinct advantage to both adapt to whatever environment came about and to really stay optimal year round.
Generally game meat is lean. Check out this chunk of kangaroo meat, it's even leaner than what most people consider lean. http://images.3aw.com.au/2012/09/12/3628557/120912-Kangaroo-Meat.jpg
If you want to eat the brains and eyes out of an animal that's an option. But don't think taking a lean steak and drowning it in ghee or lard is replicating how you're paleoithic ancestors ate. Most added fats are basically nutrient deficient empty calories compared to the fat and nutrients found in organs like brains.
Considering that most paleo followers eat commercially raised meat it's better to stick to lean meat. Consuming the extra accumulated fat of a sick animal isn't favorable at all. Eating the flesh of a sick animal isn't exactly favourable either but considering most of the toxins are stored the fat it's best to stick to lean meat if you eat CAFO meat.