As I am sure you're aware, correlation is not causation. But you didn't say it. Plenty of studies suggest that it's how the cholesterol is carried in the blood

As I am sure you're aware, correlation is not causation. But you didn't say it. Plenty of studies suggest that it's how the cholesterol is carried in the blood that matters and this isn't just a matter of HDL and LDL; the type of LDL matters too as do triglycerides. Another important factor is inflammation i.e., high c-reactive protein levels need checking out. And of course other factors may be significant as well. To put it politely, pertinent questions remain regarding the data which Ancel Keys picked to support his high fat = heart disease hypothesis.