Do some actual research. People regularly got heart attacks throughout recorded history even if dying earlier from other things was common.
The history of coronary syndromes and sudden death, and apoplexy or stroke, goes back to antiquity and has been thoroughly treated by historians and experts from many disciplines. By the beginning of the twentieth century, a heart attack with myocardial infarction was well known to cause death, but comprehension of it as a syndrome that one might survive was much delayed.
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Part of the historical delay and confusion in recognizing heart attacks apparently lay in the Greek word, kardialgia, which could mean either abdominal or precordial pain. Biblical and Talmudic references abound, however, about chest pain of a life-threatening nature, and Hippocrates mentions sudden death related to an episode of chest distress (Leibowitz 1970).
Leibowitz points out that the great Italian anatomist Morgagni failed to tie it all together, but nevertheless clearly described in 1761 the late pathology found in survivors of myocardial infarction in his well-known dictum: “The force of the heart decreases so much more in proportion as the greater number of its parts becomes tendonous instead of being fleshy” (ibid., 4).
http://www.epi.umn.edu/cvdepi/essay/history-of-heart-attack-...
No they didn't. Death rates from now treatable diseases were higher in the past. But if you managed to escape those and not die in a tragic physical accident, you lived basically as long as anyone else.
Go back 1,000+ years and people did occasionally live to be say 70, the difference was they where also less likely to live to be 71. And at 71 they where less likely to live to be 72 etc.
Given a large enough population you would still see very very rare cases of extreme age but you are something like 1,000 times more likely to live to 115 today than you where back in 1,000 AD. Combined with a smaller population and it’s likely nobody live to 115 until quite recently.
There is a great deal wrong with very high fat diets, the issue is there’s also a lot wrong with very high carb diets.