One study looked at whether eating more unsaturated fat compared to saturated fat helps the heart — and found no link, even though other research has suggested it might.

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.

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.

There’s a hint that eating more saturated fat might raise the risk of dying from heart disease, but the data is too messy and uncertain to say for sure.

Eating less saturated fat (like butter and fatty meats) and more healthy fats (like olive oil, nuts, and fish) is linked to people living longer and having fewer heart problems or other serious illnesses.

Eating more or less of different kinds of fats—like butter, olive oil, or vegetable oil—doesn’t seem to change your risk of heart disease, no matter what you eat instead of them. What matters more might be where the fat comes from, like whether it’s in cheese, nuts, or fried food.