Americans started eating way more soybean oil over the 20th century, and this change is linked to big increases in a type of fat called linoleic acid in both our diets and our body fat.

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Evidence from Studies

Supporting (1)

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Seed Oils as a Hypothesized Contributor to Heart Disease: A Narrative Synthesis.

Narrative Review

2026 Jan

The study talks about the same big increase in soybean and seed oils that the claim mentions, and agrees it led to more linoleic acid in people’s diets and bodies.

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Seed Oils as a Hypothesized Contributor to Heart Disease: A Narrative Synthesis.

Score: 1

DOI: 10.7759/cureus.102012

Similar Assertions

Over the last 50 years, Americans have been eating more soybean oil and other seed oils, and as a result, more of the fatty acid called linoleic acid has built up in our body fat.

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Over the last 50 years, the fat stored in our bodies has changed—more of it comes from processed vegetable oils, which might be changing how our body burns energy.

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Eating snacks with 30g of soybean oil every day for a month doesn’t make your body more inflamed or damage your blood fats, even though some people say it does.

58

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