Yes, I'm over-simplifying. But this is HN not the NEJM.
The point still stands: most heart disease is preventable. Estimates range from 50% to 80% of all heart disease being preventable by lifestyle changes.
Health education is very important and maybe the most important thing. But if 75% of heart disease went away it would still be a massive killer and worth researching.
Avoid trans fats. These are manufactured fats that are solid at room temperatures. Imagine what they do in your body. Butter melts at 95 degrees, the body is 98.7. Crisco melts at 117 Fahrenheit.