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.

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.

People who eat a lot of trans fats (like in fried or processed foods) are more likely to have heart problems than those who eat very little.

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.

People with more omega-3 fats in their blood don’t clearly have lower heart disease risk, even though the numbers hint at a possible benefit.

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.