When you find out you have heart disease, you’ll probably have to change your diet. But how far should you go?

Will a moderate shift do, like cutting back on high-fat foods? Do you need to take bigger steps, like going vegan?

To figure it out, ask yourself some key questions about your health and eating style.

1. What Does Your Doctor Say?

Ask him what your diet goals should be. Do you need to bring down your cholesterol levels and blood pressure? Do you have diabetes? Should you lose some extra pounds? Does heart disease run in your family?

These are a few of the things your doctor will consider when he gives you advice. He may also refer you to a registered dietitian, who works with people who have heart disease.

2. What Are You Eating Now?

How much you need to change your diet depends on the kind of food you eat now. Is your diet healthy? Could it be a lot better?

"If, for example, you have a cup of coffee, a fat-laden croissant, or a breakfast sandwich in the morning, followed by a fast-food burger lunch [and] a drive-thru dinner to end your commute, then you need to clear the table entirely and start new," says cardiologist John Kennedy, MD.

But if you usually eat foods that are good for you along with a few that aren't, you might just need to fine-tune your diet, rather than overhaul it.

3. How Motivated Are You?

Change takes work. If you need to make big revisions, you have to be motivated to keep it up.

Former President Bill Clinton famously traded barbecue, burgers, fries, and doughnuts for a vegan diet with very little oil to help manage his heart disease.

It took him 2 decades -- and two heart procedures -- to make the commitment. He met with Dean Ornish, MD, to talk it over first. Ornish has written several books on diets for people with heart disease.

If you want to go for that but it seems daunting, you could make changes bit-by-bit rather than overnight. For instance, instead of chips, try a handful of nuts. Replace soda with bottled water, Kennedy says.

Three Changes to Make for Sure

1. Stop eating artificial trans fats now. Even if a product says "0 trans fat" on the label, it may have up to half a gram per serving, which adds up. Check the ingredients list. "Partially hydrogenated" ingredients are trans fats.

2. Eat more fruits, vegetables, and whole grains. Experiment with meat-free meals that include beans or tofu as a protein source. You don't need to be a vegetarian or vegan to do that.

3. Limit salty, fatty, and sugary foods. Just about everyone gets too much of those things. Cut back wherever you can.

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