Swapping saturated fats (like butter) with certain vegetable oils in your food doesn't really lower your chances of having heart problems or dying early, according to big studies.

Some studies said swapping certain fats in your diet is good for heart health, but they might have been wrong because other factors like different medicines or other diet changes messed up the results.

Swapping saturated fats (like butter) with certain vegetable oils doesn't change how long people live overall, according to research studies.

If you swap out a little bit of butter and fatty meats for healthier fats like nuts and fish oil, you’re less likely to have a heart attack or die from heart disease — it’s not about eating less fat, but choosing better kinds of fat.

If you swap out butter and fatty meats for oils like olive oil or nuts, you might lower your risk of heart disease—but if you swap them for white bread or sugary snacks, it doesn’t help and might even hurt.

Some messy studies made it look like swapping certain fats in your diet lowers heart disease risk, but when scientists did better studies, they found that wasn't really true.