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 in your food doesn't really lower your chances of having heart problems or dying early, according to big studies.

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.

Eating less saturated fat doesn't seem to reliably help people live longer or avoid heart disease deaths, whether they're healthy or already have heart disease.

Multiple large-scale meta-analyses of prospective cohort studies demonstrate no statistically significant association between dietary saturated fat intake and incidence of coronary heart disease or cardiovascular disease.

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.