Switching from foods high in saturated fat (like butter) to foods full of sugar and white bread doesn’t make your heart any safer — studies show it doesn’t help prevent heart disease.

If you swap out foods like butter and cheese for sugary snacks and white bread, it might make your heart health worse by raising bad fats in your blood, lowering good cholesterol, and making your body less sensitive to insulin—which could raise your chance of having a heart attack.

If you swap out foods like butter and cheese for things like white bread and sugary snacks, it might raise your blood sugar and fat levels after meals, which could make your heart more likely to get sick.

If you swap out butter and fatty meats for carbs like bread or rice, it doesn’t clearly help your heart—but if those carbs are whole grains or veggies that don’t spike your blood sugar, they might help a little.

If you swap out butter or oil for sugary white bread or pastries, it won’t lower your risk of heart disease—and might even raise it if you’re prone to blood sugar problems.

We don’t know yet if swapping butter for bread or olive oil makes a difference for heart health — there just isn’t enough solid data from long-term studies to say for sure.