You’re right, heart disease is not caused by cholesterol, which we all need for good brain and body function, but it does contribute to both inflammation and atherosclerosis of the arteries. The more saturated fat (red meat, smoked/bbq, ultra-processed foods) we eat, the more the fat builds up in the blood and gets deposited as ‘plaques’/scales in our arteries. This narrows them and can, eventually, completely block them.
Unfortunately, Asian people make more cholesterol in their livers than most, which is proved by CHD (chronic heart disease) being one of the biggest health problems with those of Asian descent.
Other contributors to CHD include tooth decay/gingivitis which can migrate through the bloodstream to affect the heart muscle. Regular dental check-ups are important if you have high cholesterol or FH (Familial Hypercholesterolemia- inherited high cholesterol).
Perhaps the easiest way to decrease the risk is to eat less fat-heavy proteins and switch to a Mediterranean diet.
Dementia has quite a few causative factors including high cholesterol (LDL, the ‘bad’ type) - this might help explain the problems-
www.heart.org/en/news/2024/11/12/fluctuating-cholesterol-in-older-adults-tied-to-increased-dementia-risk