If you keep heating soybean oil over and over and feed it to male rats for a long time, their blood pressure goes up by a third — but if you feed them fresh oil, their blood pressure stays normal. This suggests that overheated cooking oil might be bad for blood pressure in animals.

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Evidence from Studies

Supporting (1)

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The role of repeatedly heated soybean oil in the development of hypertension in rats: association with vascular inflammation

Cohort Study

Animal

2012 Oct

Scientists fed rats oil that was heated 10 times and found their blood pressure went up, but rats fed fresh oil didn’t have higher blood pressure — so heating oil over and over seems to make blood pressure rise in rats.

Contradicting (0)

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No contradicting evidence found

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Source Study

The role of repeatedly heated soybean oil in the development of hypertension in rats: association with vascular inflammation

Score: 14

DOI: 10.1111/j.1365-2613.2012.00839.x

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If you feed male rats the same cooking oil over and over again after heating it multiple times, their main artery walls get thicker and stiffer, which might lead to high blood pressure.

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If you heat soybean oil over and over and feed it to male rats, their blood vessels may tighten up more than they should, which could raise their blood pressure.

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