Eating FAT per se doesn’t necessarily help, but minimizing the carbs, which lessens insulin, minimizes irritation/inflammation, and inflammation causes plaqueing in coronary arteries, obstructing them.
You, and I, and everyone else on the face of the planet are descended from THOUSANDS of generations of people who ate saturated fat every chance they could get.
It’s important to note that not all fats are equal.
You want Omega-3s, from Fish, Nuts, these are anti-inflammatory, also try to eat Grass-Finished meats when possible.
Omega-6s are more inflammatory, these come from your plant-oils, like Canola Oil, stay away from those.