We don’t know yet if swapping butter for bread or olive oil makes a difference for heart health — there just isn’t enough solid data from long-term studies to say for sure.

We don’t have enough reliable data yet to say if swapping butter for bread or olive oil makes a difference in heart disease risk, because not enough studies provided the right information.

Even when researchers accounted for how many total calories people ate or how much other fats they consumed, the link between saturated fat and heart disease still didn’t show up.

Eating foods with saturated fat, like butter or meat, doesn't seem to raise your risk of heart disease or dying from it, based on the studies reviewed.

Switching from foods high in saturated fat (like butter) to foods full of sugar and white bread doesn’t make your heart any safer — studies show it doesn’t help prevent heart disease.

There isn’t strong enough proof to say that eating less saturated fat and more vegetable oils will definitely prevent heart disease, according to this big review.