I get PVCs. They are typically harmless. Most people experience them at one time or another, usually after too much caffeine. A heart healthy diet is important, but to my understanding, if you have no other underlying heart conditions, that's not really going to effect the PVCs specifically, although it’s still a good idea to eat healthy! Stimulants will really aggravate it the most. Caffeine in coffee, tea, sodas. Some people are more sensitive than others. I still have a cup of coffee every day. But if I have a day where I have 2-3 cup in the morning, then an iced coffee in the afternoon, let's say, I find I will get that uncomfortable fluttering heart beat feeling. Although, after that much caffeine, a lot of people would probably complaint of heart palpitations!
Also, stress can do it. It’s hard to avoid being stressed, but I have noticed that if I am extremely worked up about something, I get them.
I would say just watch your caffeine intake and try not to get too stressed out. If they increase despite your efforts to manage them, as always, tell you doctor!