What type of food helps seniors with heart problems?

I’m originally from China, and as you know, one of our traditional drinks is green tea. Trust me, even without heart problems, you have to add green tea to your diet. Green tea boosts the process of burning fat in our body, which results in better heart performance.
I had a Persian friend in college, and she mentioned pomegranates. She said this fruit is a huge help to our blood circulation in the body and prevents arteries from becoming thick and tight.
She told me about her family and that there’s been no sign of heart disease for decades in her family because they own some massive pomegranate gardens, and they even export them to other countries. Pomegranate is their family business, and for sure, they eat it every day.