I was researching alternative feed (sad that food you can grow at home is considered alternative, but GMO crap from a mill is the norm) nutritional info for my pigs & hens today and came across this pdf. http://www.britishpigs.org/Newcastle..._materials.pdf
If you read the descriptions of beans, grains & wahtnot, it's pretty telling. They talk about gastric ulceration, gut irritation, anti-nutritive factors, etc.
Extrapolate tis info to humans, and you can see why primal is the way to go, and that properly raised meat animals are worth the money.
Seven Trees Farm - diversified subsistence farming on 1.25 acres.