Fact Check: Seed oils are inflammatory

Fact-Check: "Seed oils are inflammatory"

What We Know

The claim that "seed oils are inflammatory" has gained traction in various health discussions. However, recent scientific evidence suggests otherwise. A systematic review published in 2025 evaluated the effects of seed oils on lipid profiles, inflammatory markers, and glycemic control in diabetic and dyslipidemic patients. The review found that seed oils, particularly those derived from canola, flaxseed, and sesame, can positively influence lipid profiles and glycemic control while potentially modulating oxidative stress markers. The findings indicate that seed oils may not only be non-inflammatory but could also be beneficial for managing certain health conditions.

Furthermore, a 2014 study examined the hypothesis that linoleic acid (LA), a predominant fatty acid in many seed oils, promotes inflammation. This systematic review of 15 clinical trials found no support for the claim that dietary LA causes inflammation, reinforcing the idea that seed oils do not inherently contribute to inflammatory processes.

In addition, a report from Johns Hopkins University emphasizes that nutrition scientists generally agree that seed oils do not cause inflammation. This perspective is echoed by a Stanford University article which discusses the misunderstanding surrounding omega-6 fatty acids and their relationship to inflammation.

Analysis

The evidence against the inflammatory nature of seed oils is supported by multiple peer-reviewed studies and expert opinions. The systematic review mentioned earlier provides a comprehensive analysis of clinical studies, highlighting the potential health benefits of seed oils. It is important to note that while some studies report mixed results, the overall consensus from this review is that seed oils can have a positive impact on metabolic health.

The 2014 study critically assessed the "diet LA causes inflammation hypothesis" and found no substantial evidence to support this claim. This is significant because it challenges the narrative that has been propagated by various health influencers and media outlets regarding the dangers of seed oils.

Moreover, the Johns Hopkins report and the Stanford article provide additional context by explaining that the concerns about omega-6 fatty acids are often based on misconceptions. These sources are credible as they are backed by research from reputable institutions and reflect the consensus of nutrition experts.

While some critiques of seed oils focus on their omega-6 content, the prevailing scientific opinion suggests that when consumed as part of a balanced diet, these oils do not pose a significant risk of inflammation. This is further supported by the Harvard report which states that claims of seed oils being "toxic" lack scientific backing.

Conclusion

Verdict: False

The claim that "seed oils are inflammatory" is not supported by current scientific evidence. Multiple systematic reviews and expert analyses indicate that seed oils can be beneficial for health and do not inherently promote inflammation. The prevailing consensus among nutrition scientists is that seed oils, particularly those rich in linoleic acid, do not contribute to inflammatory processes when consumed in moderation as part of a balanced diet. Therefore, the assertion that seed oils are inflammatory is misleading and not substantiated by credible research.