The Truth About Canola Oil: Why You Should Avoid This Common Vegetable Oil

As a dietitian, my approach to nutrition is generally open-minded. I firmly believe that one diet does not fit all, and my focus is always on empowering individuals to discover what helps their unique body thrive, while making the healthiest choices possible within their given options. However, there is one area where I do not compromise: the widespread use of certain vegetable oils, particularly canola oil.

Navigating the complex world of cooking oils can be incredibly confusing. With countless options available, it’s challenging to discern which oils are truly beneficial for health, which are suitable for various cooking methods, and which should be avoided at all costs due to their potential harm.

When it comes to canola oil, it unequivocally lands on my list of food items that I strongly recommend eliminating from your diet immediately. Despite its ubiquitous presence in grocery stores and restaurant kitchens, and persistent marketing as a healthy choice, the controversy surrounding canola oil and its actual health implications is significant and demands our attention.

What Exactly is Canola Oil? Unpacking Its Origins and Processing

Canola is not a natural plant but a genetically modified (GM) crop developed in the 1970s by researchers from Agriculture and Agri-Food Canada and the University of Manitoba. It originated from traditional plant breeding techniques applied to rapeseed, a plant belonging to the cabbage or mustard family. The name “canola” itself is a portmanteau derived from “Canada” and “ola,” meaning oil (1). Canola was engineered specifically to be a cost-effective alternative to oils naturally high in saturated fats, aiming to provide a supposedly healthier option for consumers.

While often praised for being rich in omega-3 fatty acids and a good source of oleic acid, these perceived benefits are often overshadowed by other critical factors that contribute to its classification as one of the most concerning oils on the market.

Canola oil is a highly refined oil, meaning it undergoes extensive processing to be extracted and made shelf-stable. This process often includes partial hydrogenation, a chemical process that transforms liquid vegetable oils into solid or semi-solid fats. This step is intended to increase the oil’s stability and shelf life, but it also dramatically increases its level of trans fats. Trans fats are notorious for their detrimental effects on human health, scientifically proven to raise levels of harmful LDL cholesterol while simultaneously lowering beneficial HDL cholesterol. For optimal health, trans fats should be avoided as frequently as possible.

The genetic modification of canola has become a dominant feature of its cultivation. After years of widespread adoption in Canada, nearly 90 percent of the canola oil grown in the U.S. was genetically modified by 2009 (2). This widespread genetic engineering is a significant part of the larger controversy surrounding canola oil.

The GMO Factor: Understanding Genetically Modified Organisms

Genetically Modified Organisms (GMOs) refer to plant or animal products that have had their DNA altered in a laboratory. This alteration involves introducing genes from other plants, animals, viruses, or bacteria (3). The primary purpose of creating GMO crops is often to introduce traits like resistance to pests, diseases, or herbicides, or to enhance nutritional value or shelf life.

However, the safety of GMOs has been a subject of intense debate and public scrutiny for valid reasons. Many consumers and scientists question the long-term health and environmental impacts of consuming foods derived from genetically altered crops. This concern is often exacerbated by the influence of powerful agricultural corporations that dominate the market for these products, employing tactics that raise ethical questions about transparency and independent research.

Monsanto’s Influence and Glyphosate Concerns

To truly understand the implications of GMOs, particularly in relation to canola oil, we must examine the role of Monsanto. Monsanto, a global modern agriculture company, positioned itself as a provider of sustainable agriculture solutions, promising to feed a growing world population. Yet, its history is marked by controversy and dominance in the genetic engineering landscape.

Monsanto has been responsible for developing and marketing a vast majority of the genetically engineered (GE) crops cultivated worldwide. Their portfolio includes GM seeds for major crops such as soybeans, corn, canola, cotton, sugar beets, and alfalfa. Farmers wishing to purchase these GM seeds from Monsanto are often required to sign restrictive agreements, which typically limit their ability to save seeds for future planting and, critically, prohibit independent research on the performance and safety of these crops.

A cornerstone of Monsanto’s business model was the development of Roundup, a glyphosate-based herbicide, in the 1970s. Glyphosate rapidly became the world’s most widely used pesticide. Monsanto then ingeniously developed “Roundup-Ready” crops, which were genetically engineered to be resistant to glyphosate. This meant farmers could spray their entire fields with Roundup to kill weeds without harming their cultivated GM crops, leading to an unprecedented increase in herbicide use.

The widespread use of glyphosate has raised significant health alarms. In 2015, the World Health Organization’s International Agency for Research on Cancer (IARC) classified glyphosate as “probably carcinogenic to humans,” identifying it as an environmental factor that can contribute to cancer development (4). This classification sparked numerous lawsuits against Monsanto, alleging that the company failed to warn consumers about the cancer risks associated with Roundup.

For more detailed information on the extensive controversy surrounding Monsanto’s Roundup, resources like Dr. Axe’s article provide further insights into the health concerns and legal battles.

Beyond human health risks, the excessive application of pesticides like glyphosate, integral to Monsanto’s GM crop system, has caused significant environmental damage. It has led to the proliferation of herbicide-resistant “superweeds,” forcing farmers to use even more potent chemicals. Furthermore, glyphosate residues have been detected in disturbing places: in the milk and meat of cows, and alarmingly, in human urine (6). This widespread contamination underscores the pervasive nature of these chemicals in our food chain and environment.

The public outcry and legal challenges against Monsanto led to a significant corporate development. In August 2018, the German pharmaceutical and chemical giant Bayer formally acquired Monsanto in a colossal $66 billion merger. As part of this acquisition, Bayer announced its intention to drop the Monsanto name, ostensibly to distance itself from the brand’s controversial reputation and to win back consumer trust. However, critics argue that this name change does not alter the underlying practices or the inherent risks associated with the products themselves.

Recent reports continue to highlight the ubiquity of glyphosate. For instance, testing has revealed the presence of Roundup weed killer in popular breakfast cereals like CHEERIOS and QUAKER products (HERE). According to the Environmental Working Group (EWG), glyphosate poses an especially concerning problem for children. The U.S. Environmental Protection Agency (EPA) has found that children between the ages of one and two experience much higher exposure levels than older individuals. The EWG estimates that their daily glyphosate intake is approximately 230 times the established 160 parts per billion (ppb) benchmark, underscoring the urgent need for greater awareness and protection.

The Silent Threat: Inflammation and Omega-6 Overload

For decades, trusted institutions such as government agencies, the American Heart Association, and the National Institutes of Health have promoted vegetable oils as “heart-healthy” and cholesterol-lowering, while simultaneously demonizing saturated fats like coconut oil. This narrative has significantly misled the public.

The reality is that many common vegetable oils, including canola, sunflower, cottonseed, soybean, and corn oil, contain exceptionally high amounts of omega-6 fatty acids. While omega-6 fatty acids are essential for the body, their overconsumption, especially when the ratio of omega-6 to omega-3 is drastically skewed, contributes significantly to chronic inflammation throughout the body (7). Our bodies require both types of fatty acids, but modern Western diets have created a severe imbalance. Most Americans currently consume 20-50 times more omega-6s than is considered healthy. This imbalance is largely fueled by the pervasive presence of refined vegetable oils in processed foods and the decreased consumption of grass-fed and wild-caught animal products, which offer a healthier omega-3 profile. The ideal balance we should strive for is a 1:1 ratio of omega-6 to omega-3.

Chronic inflammation is a root cause of numerous modern diseases, including heart disease, diabetes, autoimmune disorders, and certain cancers. The perceived “health benefits” of these vegetable oils are undermined by their inflammatory potential when consumed in excess. To delve deeper into this critical issue, consider listening to the “Vegetable Oil, the Silent Killer” podcast with Dr. Cate Shanahan, available here.

In addition to canola, other vegetable oils to be wary of due to their high omega-6 content and processing methods include sunflower, cottonseed, soybean, and corn oil.

Practical Steps to Minimize Exposure and Boost Health

Reducing your exposure to harmful vegetable oils and the glyphosate associated with GMOs is a crucial step towards improving your overall health. Here are actionable strategies:

Choose Organic & Local Whenever Possible

One of the most effective ways to avoid foods sprayed with pesticides and genetically modified ingredients is to choose certified organic products. The use of genetic engineering (GMOs) is strictly prohibited in certified organic farming. This means an organic farmer cannot plant GMO seeds, an organic cow cannot consume GMO alfalfa or corn, and an organic food producer cannot use any GMO ingredients in their products. While shopping organic can be a privilege due to cost, it offers a strong assurance against these concerns. If budget is a constraint, prioritizing foods on the Dirty Dozen list (fruits and vegetables most likely to contain pesticide residues) and opting for their organic versions is an excellent next best option.

Additionally, make an effort to shop from and support your local farmers. Visit farmers’ markets and engage with the growers. Many small, local farms practice organic methods, even if they haven’t obtained the expensive official organic certification. Building a relationship with your farmer can provide valuable transparency about their growing practices.

Avoid All GMO-Foods

GMO crops are engineered to withstand massive amounts of herbicides, particularly glyphosate. As discussed, Monsanto developed its GMO crops to be “Roundup-Ready,” allowing farmers to douse their entire fields with Roundup, killing only the weeds and not the genetically altered plants. This means GMO foods inherently come with high levels of pesticide residues.

Crucially, glyphosate residues cannot be removed by washing, nor are they broken down by cooking. They are absorbed into the plant’s tissues. The more we learn about glyphosate, the clearer it becomes how dangerous it truly is, making the avoidance of GMO foods a priority for reducing your chemical burden.

Consume Plenty of Dietary Probiotics

Glyphosate is not just an herbicide; it was also patented as an antibiotic in 2010. This means it actively kills both beneficial and harmful bacteria. When consumed, glyphosate can disrupt the delicate balance of your gut microbiome, destroying the “good” bacteria essential for digestion, nutrient absorption, and immune function. To counteract this, consistently consuming dietary probiotics is vital. Probiotics are live microorganisms that line your digestive tract, supporting your body’s ability to absorb nutrients and fight infections. Excellent sources of dietary probiotics include fermented vegetables like sauerkraut and kimchi, coconut kefir, some organic yogurts (with live active cultures), and kombucha.

Be Aware When Dining Out

Dining out frequently can inadvertently expose you to an abundance of unhealthy oils, especially canola oil, as restaurants often prioritize cost-effectiveness. When ordering food, don’t hesitate to ask your server about the types of oils the restaurant uses for cooking. This is particularly important if you dine out multiple times a week. If possible, request that your food be prepared with healthier alternatives like olive oil, or even with no added oil, if appropriate for the dish. Your health is worth the inquiry.

Always Check Your Labels

Canola oil, along with other refined vegetable oils, has infiltrated a vast array of packaged food items, often appearing in products where added oils seem unnecessary. Next time you’re grocery shopping or even reviewing items in your pantry, make it a habit to meticulously check ingredient lists. You will likely be surprised by how common it is to find these vegetable oils. They are routinely found in everything from salad dressings, spreads, dips (like hummus), granola bars, and even seemingly “healthy” snacks. Many ready-to-eat foods, even from health-conscious stores, frequently contain vegetable or canola oils. Becoming a label detective is your first line of defense.

Be an Advocate: Educate and Share

A significant portion of the population remains unaware of proper nutrition, let alone the critical impact of the types of oils used in their food. By making informed choices yourself, you become a catalyst for change. Take the initiative to educate others – friends, family, and your community – about the real and potential harm that common vegetable oils and GMOs pose to both human health and our environment. This knowledge is powerful, and our collective awareness is essential to advocate for healthier food systems and protect our well-being.

Embracing Healthier Oil Alternatives

The good news is that there are many wholesome and beneficial oil alternatives to replace canola and other inflammatory vegetable oils in your kitchen. Making these swaps can significantly improve your health profile.

Avocado Oil

Avocado oil boasts a high smoke point (around 400°F or 204°C), making it an excellent go-to for all sorts of cooking, sautéing, and even roasting. It is rich in monounsaturated fatty acids, which are highly beneficial for heart health, and packed with vitamin E, a powerful antioxidant. For the best quality, always opt for avocado oil that is organic, extra virgin, unrefined, and cold-pressed. It’s ideally suited for medium to high-heat cooking and has a wonderfully neutral flavor that won’t overpower your dishes.

Coconut Oil (in moderation)

Extracted from the meat of coconuts, coconut oil is unique for its high concentration of medium-chain fatty acids (MCFAs). These include caprylic acid, lauric acid, and capric acid. MCFAs are easily digested and are processed by the liver for immediate energy use rather than being stored as fat, making them a unique energy source. Beyond its metabolic benefits, coconut oil possesses antimicrobial, antiviral, and antifungal properties, can help reduce inflammation, and has been linked to preventing gum disease and aiding in weight management. When choosing coconut oil, prioritize extra-virgin, cold-pressed, and unrefined varieties. It’s best for cooking at medium to lower temperatures due to its smoke point.

Extra Virgin Olive Oil (EVOO)

A cornerstone of the Mediterranean Diet, extra virgin olive oil (EVOO) is predominantly composed of monounsaturated fatty acids. It is renowned for its abundant antioxidants, which contribute to its numerous health benefits. EVOO has been shown to support heart and brain health, combat oxidative stress, lower the risk of diabetes, assist in weight loss, and even help fight certain cancers. However, due to its lower smoke point, EVOO is not recommended for high-heat cooking, as it can oxidize readily and lose its beneficial compounds. It is best enjoyed drizzled generously over dishes after preparation, in dressings, or for light sautéing at low temperatures.

Ghee (Clarified Butter)

Ghee is clarified butter that has been simmered gently to separate and strain out its milk solids and water. This process results in a pure butterfat product that is naturally free of lactose and casein, making it an excellent option for those with dairy sensitivities. Ghee has a very high smoke point, making it ideal for high-heat cooking, frying, and roasting without fear of degradation. It is also a fantastic source of conjugated linoleic acid (CLA), a naturally occurring fatty acid found in grass-fed meat and dairy products known for its ability to reduce body fat and its potential link to fighting cancer (8). Ghee adds a rich, nutty flavor to dishes.

Grass-fed Butter

Butter derived from grass-fed cows is nutritionally superior to conventional butter. Like ghee, it is a rich source of CLA. Furthermore, it contains higher levels of fat-soluble vitamins, particularly vitamin A, thanks to the cow’s healthy, grass-centric diet. Grass-fed butter also possesses anti-inflammatory properties, making it a healthier choice for cooking and baking compared to highly processed vegetable oils. Its rich flavor and creamy texture make it a versatile cooking fat.

Smart Baking Substitutions for Healthier Treats

Beyond savory cooking, it’s equally important to consider your oil choices when baking. Here are some excellent substitutes for unhealthy vegetable oils in your favorite recipes:

Avocado Oil for Baking

While avocado oil might not be the cheapest option, it’s an outstanding replacement for vegetable oils in baking. Its heart-healthy monounsaturated fats, antioxidants, and higher smoke point make it a superior choice. Crucially, its neutral flavor ensures it won’t alter the taste of your baked goods. My personal favorite brand is Chosen Foods, which offers a mild flavor and can be found at retailers like Trader Joe’s and Costco. You can typically use avocado oil as a 1:1 ratio swap for vegetable oil in most baking recipes.

Coconut Oil for Baking

Coconut oil is a wonderful alternative for baking, especially in sweeter recipes like muffins, cakes, and cookies. It imparts a rich and creamy flavor that can enhance the taste profile of your treats. Keep in mind that coconut oil is solid at room temperature, so you’ll need to gently melt it before incorporating it into your recipe. While it is higher in saturated fats, using it in moderation within a balanced diet is perfectly fine. It also typically works as a 1:1 ratio swap for vegetable oil.

Fruit Purees and Mashed Fruits

Sometimes, the best substitute isn’t even an oil! Have you considered using unsweetened applesauce or mashed fruits like banana? This approach offers several advantages: it significantly reduces the calorie content and, if you choose unsweetened options, also cuts down on added sugars. While it may slightly alter the consistency of your baked goods, often resulting in a moister, more “cakey” texture, the health benefits are substantial. As a general guideline, substitute 3/4 cup of unsweetened applesauce for every 1 cup of vegetable oil called for in a recipe.

Final Thoughts: Transforming Your Kitchen for Optimal Health

When it comes to selecting oils for baking, cooking, or even choosing packaged snacks, canola oil should unequivocally not be your first, second, or even fourth choice. The mounting evidence linking genetically modified organisms (GMOs) to a host of negative side effects, alongside the extensive processing and pro-inflammatory omega-6 content, makes it abundantly clear that avoiding canola oil at all costs is a critical step for safeguarding your health.

Fortunately, the culinary world offers an abundance of much healthier options, each bringing a unique set of health benefits to your table. By making informed decisions about the fats you consume, you not only protect yourself from potential harm but also actively nourish your body with ingredients that support vitality and well-being. It’s time to transform your kitchen and your diet by embracing these superior alternatives.

References:
1) https://www.canolacouncil.org/oil-and-meal/what-is-canola/
2) https://www.canolawatch.org/wp-content/uploads/2011/10/20110309_FPJ_Aut11_Beckie.et_.al_.pdf
3) https://www.huffingtonpost.com/margie-kelly/genetically-modified-food_b_2039455.html
4) https://www.nytimes.com/2015/03/28/business/energy-environment/decades-after-monsantos-roundup-gets-an-all-clear-a-cancer-agency-raises-concerns.html
5) https://www.organicconsumers.org/campaigns/millions-against-monsanto
6) https://www.omicsonline.org/open-access/detection-of-glyphosate-residues-in-animals-and-humans-2161-0525.1000210.php?aid=23853
7) https://www.sciencedirect.com/science/article/abs/pii/S0753332202002536
8) https://www.sciencedirect.com/science/article/pii/S1871403X13001968