Question 1

Is margarine or butter worse for your heart?

Accepted Answer

It depends on the margarine. Old-style margarine made with partially hydrogenated oil was worse than butter because it contained artificial trans fat, which raises bad cholesterol and lowers good cholesterol. Modern margarines are largely reformulated without those trans fats, making them a reasonable choice again.

Question 2

Why was margarine considered heart healthy?

Accepted Answer

In the 1950s and 60s, saturated fat from butter and meat was blamed for the heart disease epidemic, so health authorities urged people to switch to vegetable-oil margarine. The advice ignored that the margarine of the era was solidified with partial hydrogenation, which produced harmful trans fat.

Question 3

Who discovered that trans fat was dangerous?

Accepted Answer

Biochemist Fred Kummerow found artificial trans fat accumulating in the artery walls of heart attack victims and published it in Circulation in 1957. His warning was largely ignored for decades until the Harvard Nurses' Health Study confirmed the risk in the 1990s.

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