That's all. This is just nonsense. First of all, I seriously doubt you can provide reliable figures from the Middle Ages in Europe, for example, given that medical records were so sparse and medicine such an unreliable science at the time. Secondly, there was a much lower lifespan in those days so that people died from a thousand other illnesses long before they ever got to an age where they could start getting heart-disease.
I'm actually referring to just prior to the introduction of vegetable oils - around the early 1900's.
And here's a relatively reliable, well documented example of proof.
http://www.westonaprice.org/know-your-fats/skinny-on-fats"
Before 1920 coronary heart disease was rare in America; so rare that when a young internist named Paul Dudley White introduced the German electrocardiograph to his colleagues at Harvard University, they advised him to concentrate on a more profitable branch of medicine. The new machine revealed the presence of arterial blockages, thus permitting early diagnosis of coronary heart disease. But in those days clogged arteries were a medical rarity, and White had to search for patients who could benefit from his new technology. During the next forty years, however, the incidence of coronary heart disease rose dramatically, so much so that by the mid fifties heart disease was the leading cause of death among Americans. Today heart disease causes at least 40% of all US deaths. If, as we have been told, heart disease results from the consumption of saturated fats,
one would expect to find a corresponding increase in animal fat in the American diet. Actually, the reverse is true. During the
sixty-year period from 1910 to 1970,
the proportion of traditional animal fat in the American diet declined from 83% to 62%, and butter consumption plummeted from eighteen pounds per person per year to four. During the past eighty years, dietary cholesterol intake has increased only 1%.
During the same period the percentage of dietary vegetable oils in the form of margarine, shortening and refined oils increased about 400% while the consumption of sugar and processed foods increased about 60%."