I have said this before on CAF, but I’ll say it again.
One might question grain-fed beef, but grass-fed contains about the same amount of “good” cholesterol as fish.
Julius Caesar remarked at the health and vigor of the ancient Teutons, and ascribed it to their nearly all-meat diet. They were herders and hunters, and didn’t raise grain or vegetables at all, though perhaps they scrounged up some non-poisonous wild herbs and fruits here and there.
Of perhaps further interest, not topical but somewhat related, Caesar described them as being an extremely indolent people who, nevertheless, engaged in occasional bursts of extreme activity like fighting. No joggers, those Teutons, unless they were chasing down Roman soldiers or running from them. So one might be permitted to wonder about other “healthy” advice as well.
Among history’s foremost fighters were the Alans. (I believe it was the Alans. Might have been a similar tribe) They were “hit-and-run” marauders who harassed the Persian Empire terribly, looting and killing. One of the Persian emperors decided to go after them, and took his army miles and miles into the Eurasian steppes. But the only contact with the Alans was an occasional hit-and-run attack.
Exasperated, the emperor sent them a message challenging them to stand and fight. Their leader replied approximately like this: “We have no cities to defend or crops for you to burn. We only have our herds. But bother the graves of our ancestors and then you will learn whether we will fight you.”
Not even knowing where such graves might be, how he would recognize them, or what he would have to go through if he found them, the Persian emperor turned around and took his army back to Persia.