Hey giggle,
I really crack up when people come out with different "heart healthy" diets. They all share the same principle, low fat and well balanced vitamins, minerals and proteins. Now, if you combine a diet like that with 30 - 45 of even MILD cardio everyday your heart will probably never be in danger until you reach
50-60 age range. Because at that age your heart valves will start going thru "wear and tear" and lead to congestive heart failure and it's complications.
To give you a more definitive answer I would have to look at
your lipid profile when you get your blood work done. Keep your blood pressure within normal limits and also monitor you're heart rate. There are so many factors that I would have to take into account to assess the condition of your heart.
But, with lean low carb/higher protein diet.. your heart should be happy

But With medicine there's never a definite answer until you do a thorough check. because some people might be born with tiny little heart defects that will go undetected until you get older.
Workout, do cardio everyday and try to keep your fat content low… I promise that will keep you're heart healthy… Once in a while eating greasy food isn't so bad, enjoy your life you only get one!