Canola Oil's Health Benefits and Dispelling Myths

Canola Oil's Health Benefits and Dispelling Myths

We are not saying Canola will be a magic cure to solve the world’s problems. But let’s get a few things right about Canola. 

  • Wrongly lumped into a group with "seed oils". This is like saying french fries and broccoli should have the same health calims because they are both vegetables
  • Lowers total cholesterol and LDL cholesterol
  • Higher concentration of Omega 3 fatty acids than olive and avocado oils
  • More vitamin E than olive oil
  • Half the saturated fat as olive oil 
  • Has an FDA approved health claim lowering the risk of heart disease
  • Canola has anti-inflammatory properties and is not pro-inflammatory
  • Comes from a super food family of vegetables
  • Canola has not been shown to cause Alzheimer’s (this made great headlines but not true)
  • Canola is not and never was banned in Europe

We invite you to read the full articles cited below. This educational page is more complex than our other articles because it needs to be. To understand how recent research has evaluated medical health benefits about canola is technical. The bullet list above is a summary for those of you looking for the short version.  
If you made it this far, you’re going to love reading all about the amazing canola oil.  

History

Canola oil and rapeseed oil are not the same thing. Canola is a food-grade version of certain rapeseed varieties specifically bred for low erucic acid. More on Canola later, lets learn about rapeseed. The name for rapeseed comes from the Latin word rapum meaning turnip. Rapeseed relatives include many healthy vegetables including the turnip, cabbage, brussels sprouts, mustard, and rutabaga. Rapeseed belongs to the genus Brassica and this genus of oil seed varieties are some of the oldest plants cultivated by humanity, with documentation of their use in India 4,000 years ago and use in China and Japan 2,000 years ago.

Canola is different from traditional rapeseed and was bred in the early 1970's at the University of Manitoba in Canada.  This new rapeseed variety was bred to reduce the erucic acid content. It used to also be known as Low Erucic Acid Rapeseed (LEAR) oil. So why decrease the erucic acid levels. Studies done in the 1970's showed heart toxicities at high levels. This caused many governments to get involved to protect their citizens. It turns out that these studies were done in rats, and they metabolize or process erucic acid differently than humans. Further studies showed that the heart problems seen in rats are not likely relevant to humans and heart health. The toxic effects of erucic have not been seen in pigs, primates, or any other animals [P1]. Fish are a known source of erucic acid in fact salmon both wild and farmed contain between 6 and 220 mg erucic acid per 100 g (palm size) fillet [P2]. Eating rapeseed oil and increased heart disease, has not been shown in humans [P3]. There are no reports of harm to people from dietary consumption of erucic acid [P4].

Since LEAR oil was probably hard to market a new name, Canola, was invented. Canola was originally a trademark name and is a blend of "CAN" from Canada and "OLA" from "oil low acid". Low acid because the erucic acid levels are dramatically different. Canola is now a generic term for edible varieties of rapeseed oil in North America and Australia. The name canola also makes it easy to keep it from being confused with natural rapeseed oil. Canola oil is limited by government regulation to a maximum of 2% erucic acid by weight in the US and the EU. These low levels of erucic acid further keeping it from causing harm in humans.

Heart health

Canola oil, a plant-based oil rich in monounsaturated fatty acids (MUFA), has been shown to have beneficial effects on cardiovascular health. In 2006, canola oil was given a qualified health claim by the United States Food and Drug Administration (FDA) for lowering the risk of coronary heart disease. This is remarkable and should not be overlooked. The recommendation resulted from the high levels of unsaturated fats [H1]. Consumption of canola oil has been associated with significant reductions in

  • total cholesterol
  • low-density lipoprotein cholesterol (LDL-C)
  • LDL-C to high-density lipoprotein cholesterol (HDL-C) ratio
  • apolipoprotein B (Apo B) levels

compared to other edible oils.[H2] These effects were observed when canola oil replaced about 15% of total caloric intake [H2]. 

Compared to olive oil (arguably the King of healthy oils), canola was shown to decrease total cholesterol, LDL-C, LDL/HDL ratio, and triglycerides in very low-density lipoprotein (VLDL-TG) [H2, H3].

When compared to sunflower oil, canola oil improved LDL-C and LDL/HDL ratio.[H2].

In comparison with saturated fats, canola oil improved total cholesterol, triglycerides, LDL-C, total cholesterol/HDL ratio, and Apo B [H2].

The American Heart Association recommends replacing dietary saturated fat with unsaturated fats, especially polyunsaturated fats, to lower the incidence of cardiovascular disease.[H4] Canola oil, being high in unsaturated fats, aligns with this recommendation.  

Anti-inflammatory

Canola is not "pro"-inflammatory by current evidence. In fact, studies suggest that it may have anti-inflammatory properties. A study by Kruse et al. found that daily supplementation of 50g of canola oil over 4 weeks resulted in reduced gene expression of the pro-inflammatory cytokine IL6 in subcutaneous adipose tissue in obese men [AI1]. Another study by Ion et al. found that canola oil mimetic was anti-inflammatory, as opposed to corn oil mimetic which was pro-inflammatory. [AI2] 

Doesn't cause Alzheimer’s

A 2017 study touted that Canola oil causes may cause Alzheimer’s. This was a great headline and sold a lot of "newspapers". However, before throwing the baby out with the bath water we should examine if this is a cause or a correlation or maybe just something interesting that we should think about.  
The study observed that mice fed with canola oil exhibited weight gain and performed slightly worse in one specific cognitive test, and a notable presence of protein variants consistent with unique plaques and tangles found in the brains of people with Alzheimer's Disease. 
However, the mice showed no significant differences in other cognitive tests. The authors' conclusions aligned with the data, except for their report of "significant deficits in working memory," which did not correspond to the results of other tests. The authors also compared the outcomes of this study with their previous research on the potential protective effects of olive oil, which shares similar properties with canola oil. However, their findings did not indicate similar benefits with canola oil. While the study's results are based on genetically modified mice fed with a high oil diet, the study's relevance to humans remains unclear. Thus, the data does not support the assertion that canola oil causes memory problems, dementia, obesity, or Alzheimer's Disease in humans. 
The results showed that the oil-fed mice gained significantly more weight.  The mice performed slightly less well on a standard mouse test (the Y-maze) but performed comparably in two other tests. The brains of oil-eating mice contained a ratio of protein variants consistent with the AD signature plaques and tangles and were lower in a protein marker for neuronal integrity.  All other markers were comparable. 
The authors’ conclusions were generally in line with the data. However, they did report, “significant deficits in working memory,” an interpretation that maybe isn’t entirely consistent with a 20% deficit in one behavioral test, when other tests were not statistically different.    
In the paper, the authors compared the results of this study to their earlier report that showed potential protective effects of olive oil. Canola oil and olive oil have similar profiles in ratios of saturated, monounsaturated, and polyunsaturated fat, so it is a good hypothesis to test. The authors did not find the same benefits in canola oil. A direct side-by-side comparison of canola and olive oil was not performed, In a previous study they showed that olive oil consuming mice also gain weight. 

The scientific interpretation based on the limits of the experimental design—mice genetically altered to exhibit AD-like neural pathology, fed more calories from oil, become obese, showed evidence of markers consistent with lower neurological function, and exhibited slight symptoms consistent with memory problems.

The data do not show, in any way, that canola oil causes memory problems, dementia, obesity, and Alzheimer’s Disease, especially in humans.

Maybe some of the negative consequences of using canola oil is from #1 eating in excess #2 from Rapeseed oil not specifically used to make canola oil #3 weight gain. We do not promote Canola as the world’s most healthy oil but believe generalized statements like it is "pro-inflammatory" or "causes Alzheimer’s" are not true and misleading. We recommend people seriously interested in learning about canola check out the studies below. 

Canola not banned in Europe

Is canola oil banned in Europe? Long story made short: Canola oil is not banned in Europe. Turns out it was just a rumor. 

 

P1: The Relevance to Humans of Myocardial Lesions Induced in Rats by Marine and Rapeseed Oils. In High and Low Erucic Acid Rapeseed Oils. Grice, H. & Heggtveit, H. (1983). Elsevier. p. 560.
P2: Erucic acid (22:1n-9) in fish feed, farmed, and wild fish and seafood products. N.H. Sissener, R. Ørnsrud, M. Sanden, L. Frøyland, S. Remø, A.-K. Lundebye. Nutrients, 10 (2018), p. 1443
P3: Food Standards Australia New Zealand (June 2003) Erucic acid in food: A Toxicological Review and Risk Assessment Technical report series No. 21; Page 4 paragraph 1; ISBN 0-642-34526-0, ISSN 1448-3017
P4: Luger CL et al. Food Safety and Foodborne Toxicants. Chapter 14 in Hayes' Principles and Methods of Toxicology, Sixth Edition. Eds A. Wallace Hayes, Claire L. Kruger. CRC Press, 2014 ISBN 9781842145371. Quote: "In humans. however. although the long-term use of Lorenzo's oil (oleic acid and erucic acid) in the treatment of adrenoleukodystrophy or adrenomyeloneuropathy leads to thrombocytopenia and lymphopenia (Unkrig et al. 1994), adverse effects from dietary consumption of erucic acid have not been reported."
H1:"Qualified Health Claims, Letter of Enforcement Discretion U.S. Food and Drug Administration: Unsaturated Fatty Acids from Canola Oil and Reduced Risk of Coronary Heart Disease". Schneeman, B.O. (6 October 2006). US Food and Drug Administration. Retrieved 3 September 2008.
H2:The Effects of Canola Oil on Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis With Dose-Response Analysis of Controlled Clinical Trials. Amiri M, Raeisi-Dehkordi H, Sarrafzadegan N, Forbes SC, Salehi-Abargouei A. Nutrition, Metabolism, and Cardiovascular Diseases : NMCD. 2020;30(12):2133-2145. doi:10.1016/j.numecd.2020.06.007.
H3: Comparison of Canola Oil and Olive Oil Consumption on the Serum Lipid Profile in Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Pourrajab B, Sharifi-Zahabi E, Soltani S, Shahinfar H, Shidfar F. Critical Reviews in Food Science and Nutrition. 2022;:1-15. doi:10.1080/10408398.2022.2100314.
H4: Dietary Fats and Cardiovascular Disease: A Presidential Advisory From the American Heart Association. Sacks FM, Lichtenstein AH, Wu JHY, et al. Circulation. 2017;136(3):e1-e23. doi:10.1161/CIR.0000000000000510.
AI1: Dietary Rapeseed/Canola-Oil Supplementation Reduces Serum Lipids and Liver Enzymes and Alters Postprandial Inflammatory Responses in Adipose Tissue Compared to Olive-Oil Supplementation in Obese Men. Kruse M, von Loeffelholz C, Hoffmann D, et al.Molecular Nutrition & Food Research. 2015;59(3):507-19. doi:10.1002/mnfr.201400446.
AI2:Effects of Canola and Corn Oil Mimetic on Jurkat Cells. Ion G, Fazio K, Akinsete JA, Hardman WE. Lipids in Health and Disease. 2011;10:90. doi:10.1186/1476-511X-10-90. Copyright License: CC BY. 
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