A good diet can lower your risk of heart attack substantially.

Avoid saturated fats.
Saturated fats (red meat, butter, cream, lard, cheeses) and trans-unsaturated fats (labeled hydrogenated by the food industry) both increase risk of heart attack.

Seek out Omega-3 fats.
Diets high in Mono and Poly-unsaturated (Omega-3) fats can decrease the risk of heart attack by up to 70%. Omega-3 fats are found in:
Olive oil
Canola oil
Fish oil
Walnut oil
Flax Seed oil

Below is a link to the American Heart Associations Heart Healthy Cookbooks web page.

http://www.americanheart.org/presenter.jhtml?identifier=3040179