Did seed oils cause heart disease?
Seed Oils as a Hypothesized Contributor to Heart Disease: A Narrative Synthesis.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A long time ago, people didn’t get heart disease much. Then, in the 1900s, they started eating more seed oils like soybean oil. At the same time, heart disease went up. This study looks at old data and science to see if the oil could be part of the problem.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A long time ago, people didn’t get heart disease much. Then, in the 1900s, they started eating more seed oils like soybean oil. At the same time, heart disease went up. This study looks at old data and science to see if the oil could be part of the problem.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
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Claims (5)
People started eating more seed oils like corn and soybean oil in the early 1900s, and about 10 to 20 years later, heart disease became a big killer—this pattern makes some wonder if those oils might have played a role.
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.
Eating too much linoleic acid might speed up heart disease because when it gets into your blood, it can turn into harmful chemicals that damage blood vessels and cause inflammation.
Countries where people eat more linoleic acid, like the U.S. and Israel, have had higher rates of heart disease deaths, while countries like Japan and Greece, where people eat less of it, have had much lower rates — suggesting a possible link between this fat and heart disease.
Eating too much omega-6 fat—especially from vegetable oils and meat from grain-fed animals—might increase body-wide inflammation, which could lead to long-term health problems like heart disease or diabetes.