Eating foods rich in monounsaturated fats, like olive oil or avocados, doesn't seem to make heart disease risk higher or lower based on this analysis.

For people who already have heart disease, eating foods high in saturated fats—like butter or red meat—doesn’t seem to make their chances of having a heart attack or dying any higher or lower.

We don’t know yet if swapping butter and fatty meats for olive oil and avocados makes your heart healthier or not—there’s just not enough clear proof either way.

Eating more saturated fat—like in butter or red meat—doesn’t seem to make people more likely to get heart disease, based on this big review of studies.

The amount of saturated fat found in your blood doesn’t seem to predict whether you’ll get heart disease, based on blood tests from many people.

Even though eating trans fats seems bad for your heart, the amount of trans fat found in your blood doesn’t clearly link to heart disease risk in these studies.