In recent years, “seed oils” have gone from a kitchen staple to a controversial health topic fueling debates across nutrition circles, wellness influencers, and social media platforms. Once considered heart-healthy, oils like canola, soybean, sunflower, cottonseed, and corn oil are now under fire, blamed for chronic inflammation, metabolic dysfunction, cardiovascular disease. But is the backlash against seed oils rooted in science?
The answer is a bit more nuanced than a yes or no. Run a google search and you’ll get AI’s opinion, but what you really need is to have this topic broken down by an actual real live certified nutrition consultant (me).
Seed oils–named because they are extracted from plant seeds–are a huge topic in the wellness world currently, and the topic has sparked significant debate. And now we have Robert F. Kennedy Jr., our U.S. Health Secretary and MAHA leader, loudly criticizing seed oils and campaigning to get them out of our food supply.
But is the seed oil controversy founded or just hype? Are seed oils a main driver of disease?
I got my certification in nutrition over 20 years ago, and back then in the holistic health world, we were taught that seed oils AKA vegetable oils (seed oil is not even a term used in research and is used interchangeably with vegetable oil) were inflammatory and contributed to heart disease. I even wrote a post about it here.
I was taught that seed oils, which are unsaturated fats, are highly processed and solvents are used in their extraction (which is true), thus making them unhealthy for human consumption. We were also taught that they are high in omega 6 fatty acids, and too much omega 6 contributes to inflammation. Inflammation of course is a major driver of disease. I was also taught that unsaturated fats are less stable at heat (like when you’re cooking with them) than saturated fats and that they break down and oxidize under heat, and this oxidation causes disease.
While it is true that saturated fats are more stable at heat, some vegetable oils have a fairly high smoke point. I wrote more about that here.
I once had a teacher say, have you ever actually smelled vegetable oils? They’re deodorized and don’t have a scent because they’re so highly processed. Olive oil smells like olives. Coconut oil smells like coconuts. That actually really stuck with me, because there’s something that inherently grosses me out about vegetable oil. I would never go to a canola oil tasting, yet here in Northern California I always drop by an olive oil tasting when I see one. Fresh olive oil is delightfully grassy, sometimes pungent and deliciously herbaceous. It just feels health promoting to me. Olive oil is produced from a fruit and not a seed. Can’t say that about vegetable oil.
However, nutrition science is always evolving, and it’s really data that matters over one’s feelings.
What’s Fueling the Seed Oil Debate
RFK Jr began branding common refined seed/vegetable oils (soybean, canola, corn, sunflower, safflower, cottonseed) as “toxic” and publicly stated that seed oils are poisoning Americans and driving the obesity epidemic. He’s called for a return to traditional fats like beef tallow. RFK also points to the potential environmental impact of seed oil production, including the use of pesticides and herbicides.
Wellness influencers jumped on the bandwagon, and the movement really took off when fast food chains began announcing they would use tallow, a saturated fat, instead of vegetable oils.
Side note: you as the consumer will absorb this extra cost, as beef tallow is quite a bit more expensive than vegetable oil.
The other point influencers like to use is that rates of heart disease have skyrocketed since the American Heart Association began recommending vegetable oils, and humans began consuming more vegetable oil as a result. But let’s remember that correlation does not equal causation: This means that heart disease rates increasing alongside seed oil consumption do not necessarily make that a cause.
A classic example of correlation not implying causation is the relationship between ice cream sales and crime rates. Both tend to increase during the summer months, but this doesn’t mean that eating ice cream causes crime. Instead, a third factor, like warmer weather, likely influences both, leading to increased ice cream consumption and outdoor activity, which can contribute to a higher crime rate.
Ultra-processed food consumption and sedentary lifestyles have increased dramatically alongside vegetable oil consumption also, and we have to take those factors into account.
What Does the Science Say about Seed Oils?
First off, seed oils are in fact high in omega 6 polyunsaturated fats (PUFAs). Some studies suggest PUFAs have been shown to reduce LDL (“bad”) cholesterol and, in some studies, lower the risk of heart disease when replacing saturated fats. This is one concern about replacing seed oils with saturated fat: an increase in heart disease. Some people are more likely to experience increased cardiovascular risk from saturated fats while others do not. It depends on your genome. So this is not a one size fits all improvement to replace vegetable oil with saturated fat. It could very well actually increase disease risk in some people.
While omega-6s are precursors to inflammatory compounds, the evidence does not show that typical dietary intakes of linoleic acid promote chronic inflammation in humans.
Response from Health Experts
Conclusion
The seed oil controversy is a prime example of how nutrition science, social media, and personal belief can collide, often leaving consumers confused and overwhelmed. While some concerns about the overconsumption of omega-6 fats and highly processed oils are worth considering, much of the fear around seed oils lacks strong scientific consensus. Like most things in nutrition, context, balance, and quality matter far more than any single ingredient.
Rather than chasing extremes—whether it’s eliminating all seed oils or embracing them without question—it’s more helpful to focus on overall dietary patterns, whole food choices, and personal health needs. As the science continues to evolve, staying informed and tuned into your own body (get lab work yearly to track how your diet is affecting lipids and inflammation) remains the best approach to making healthy, sustainable choices.
Welcome to my site! I am a holistic nutrition consultant based in California, though I work with clients all over the world. I love houseplants, dogs, snow sports, and music that doesn't suck.
