Folic acid is known to help reduce the risk of having a stroke. It looks like you cant do much else if your dad doesnt want to help himself a bit. Genetics might be doing their part here, theres really no way of knowing for sure why he hasnt any other complications, but thats a good thing :)
He's also not vaccinated against covid although I think he caught covid a few months ago because he was pretty Ill (He just couldn't be bothered taking a test tho). He has also never got a vaccine in his life (Apparently) and he was offered to get his covid/flu vaccine but he just doesn't want tohe is a heavy smoker and alcoholic (Does it everyday), He also use to do alot of other drugs back in his early day (I.e coke, ketamin, Ecstasy etc) but even his doctor said to him 15 years ago that he should be dead.Now I know that things such as heart attacks, Strokes etc doesn't seem to run in my family luckily and both of my grandparents (his parents) are still alive, my great grandparents (His grandparents) also lived to thier late 90s so maybe genetics plays a role here but still, I thought him having that silent heart attack a few months ago would of motivated him into getting his shit together but it hasn'tAlso, The doctor's gave him folic acid tablets to treat his blood pressure (Which I don't really understand). He also went for a scan the other day on his heart but they lost his scan results