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Social media influencers and political figures have recently targeted seed oils as harmful to human health, but medical experts and dietary guidelines emphasize that these cooking oils are safe and beneficial for heart health when consumed in moderation.
Dissecting the Anti-Seed Oil Movement
Seed oils, which include canola, sunflower, soybean, rice bran, and corn oils, are widely used in cooking and form the basis of most commercial vegetable oils. Despite recent criticism—including US Secretary of Health and Human Services Robert F. Kennedy Jr. calling them “toxic”—dietary guidelines and health researchers maintain that there is no solid evidence linking normal consumption to health harms.
Writing in The Guardian, epidemiologist Dr. Gideon Meyerowitz-Katz highlighted that Australian dietary guidelines view seed oils as safe. While seed oils are high in calories, experts state they provide beneficial unsaturated fats. Prof. Lauren Ball, director of the University of Queensland’s Centre for Community Health and Wellbeing, told The Guardian: “There’s no convincing evidence that eating seed oils like canola or sunflower oil in normal dietary amounts harms our health. In fact, these oils contain unsaturated fats, which are generally beneficial for cardiovascular health.”
Dr. Jason Wu, a professor at the University of New South Wales, agreed with this assessment, stating that “The evidence base consistently points to health benefits of eating seed oils.”
Human Data Contradicts Inflammation Claims
Criticism of seed oils largely focuses on their high content of omega-6 fatty acids, particularly linoleic acid, which opponents claim triggers systemic inflammation. Although rodent studies have shown that high doses of omega-6 fats can lead to liver dysfunction and intestinal issues in lab mice and rats, researchers note that animal studies do not reflect how the human body processes these nutrients.
Human research consistently fails to show an inflammatory link. Studies indicate that individuals who consume higher levels of linoleic acid actually face a lower risk of cardiovascular disease. In randomized clinical trials where participants were supplemented with seed oils, researchers observed no harmful effects and occasionally found minor health improvements. A randomized crossover study comparing omega-3 and omega-6 fatty acids found no difference in how both types affected inflammatory markers, leading Wu to note that claims of omega-6 fatty acids causing inflammation are “not supported by evidence.”
Comparing Seed Oils to Saturated Fats
While seed oils are frequently criticized online, scientific research demonstrates that animal fats pose a greater risk to human health due to high levels of saturated fat. Saturated fats raise low-density lipoprotein (LDL) cholesterol, commonly known as bad cholesterol, which contributes to arterial blockages and heart disease.
Replacing saturated fats with seed oils offers direct health advantages. Ball explained that “Replacing saturated fats, such as those in butter, with unsaturated fats in oils like canola and sunflower can lower LDL cholesterol, an important risk factor for cardiovascular disease.”
Meyerowitz-Katz noted that the online backlash against seed oils is primarily driven by dietary fads, such as ketogenic diets that favor high animal fat intake, and social media algorithms that reward alarmist claims. While consumption should be moderated due to calorie density, health experts confirm that using seed oils for frying, cooking, or dressings remains one of the healthiest dietary choices available.
