And they lived well into their 80s or 90s, did they?
In any event, they certainly didn't eat them on a daily basis.
Once showed my students an old Nazi "Wochenschau" praising the introduction of the "Meatless Sunday" (intended as a wartime austerity measure). The students thought that that shouldn't have been so awfully difficult to do; after all, it was only a single day per week - until I explained to them that, traditionally, Sunday had been the only day of the week on which meat would be eaten. The "Meatless Sunday" thus effectively meant foregoing meat all together. Their minds were blown!
Regards,
““By the time of the American Revolution, all the data suggests Americans were eating between 150 and 200 pounds [of meat] a year,” says Roger Horowitz, director of the Hagley Museum and Library’s Center for the History of Business, Technology, and Society, and author of Putting Meat on the American Table. “That included everything from pork to muskrats.”
https://www.popsci.com/why-americans-eat-so-much-meat/