If I understood the article correctly you recently had a heart attack and the last few years you have been healthier, loosing weight, eating right etc.
It is good that people learn from this and I think that if you had not done the healthier lifestyle approach these last few years you may not have recovered.
I have lost friends due to heart attacks and it is one of those areas that you cannot really see how healthy the heart is, it just hits you like a bus, then it hits everyone around you. The heart is still just a muscle, just an important one and from before you are born it beats, it beats every day, other muscles get a rest but the heart keeps going. I think its good to remember it not just what you eat, its how you made it and it is also what you choose to do with it.
I wish you all the best in your recovery and hope you get to return to the trails soon 😀
Dac