You've seen it on countless labels: salad dressings, crackers, restaurant fryers, even bottles sitting right next to olive oil on the shelf. But what actually is canola oil, and how did it become such a fixture in the American pantry? If you've ever paused in the grocery aisle wondering what you're really buying, you're not alone. Let's break down where canola oil comes from, how it's made, and what the research says about it.
What Is Canola Oil, Anyway?
Canola oil comes from the seeds of the rapeseed plant, a member of the mustard family. Rapeseed oil itself has been used for centuries, but its traditional form contained high levels of erucic acid, a compound considered undesirable for human consumption in large amounts.
In the 1970s, Canadian plant breeders developed a new variety of rapeseed with much lower erucic acid content. They gave it a fresh name: "canola," short for "Canada" and "oil, low acid." The rebrand helped distance the new oil from its less appealing predecessor, and an entirely new category of cooking oil was born.
It's worth noting that seed oils like canola are extracted from the seeds of plants, while oils like avocado oil are pressed from the flesh, or pulp, of the fruit. That distinction matters when you're comparing how different oils are made.
Why Canola Oil Became So Popular
A few factors helped canola oil take over grocery shelves and restaurant kitchens:
- Low in saturated fat: It was marketed as an alternative to fats considered less desirable at the time, aligning with the low-fat trends of the late 20th century.
- Cost-effective: Canola is inexpensive to produce at scale, which makes it appealing for large food manufacturers and restaurants.
- Neutral flavor and high smoke point: Its mild taste and ability to handle high cooking temperatures make it a versatile choice in commercial kitchens.
On paper, that sounds pretty convenient. But there's more nuance worth understanding before you decide how you feel about it.
What the Research Says About Canola Oil
How It's Processed
Making canola oil is an industrial process. Rapeseeds are typically heated to help extract the oil efficiently, and chemical solvents, most commonly hexane, are often used to pull out the remaining oil. From there, the crude oil goes through degumming, bleaching, and deodorizing steps to make it shelf-stable and neutral in flavor. These are highly refined steps compared to simple fruit-pressing methods.
Omega-6 and Omega-3 Balance
Canola oil does contain some ALA, a type of omega-3 fatty acid, but it's also fairly high in omega-6 fatty acids. Research suggests that the ratio of omega-6 to omega-3 in the diet matters more than the presence of omega-3s alone, and that many modern diets already lean heavily toward omega-6, which may promote inflammation in the body when out of balance.
Oxidation and Heat Stability
Oils that are higher in polyunsaturated fat, like canola oil, tend to be less stable when exposed to heat, light, and air compared to oils higher in monounsaturated or saturated fat. This means they can be more prone to oxidation during high-heat cooking, particularly during refining or repeated frying.
GMO Status
A large portion of canola crops grown today are genetically modified to resist herbicides, which allows for more widespread herbicide use during farming. If you're someone who pays close attention to GMO status on labels, this is worth knowing.
Reading Labels with Confidence
The good news is that you're fully equipped to make informed choices once you know what to look for. Canola oil shows up in more places than you might expect, from salad dressings and mayonnaise to crackers and baked goods. A quick scan of the ingredient list is often all it takes to spot it.
If you're curious about how other common oils stack up, our complete guide to seed oils and our breakdown of identifying seed oils in everyday foods are great next stops for label-reading confidence.
The Takeaway
Understanding what canola oil is, and how it's made, helps take the mystery out of one of the most common ingredients on grocery shelves. Whether you choose to cook with it, avoid it, or simply want to make more informed choices at the store, knowledge is your best tool. Feeling good about what's in your pantry starts with feeling confident about what you're reading on the label, and that's a habit worth building one ingredient at a time.
Read next: Is Avocado Oil a Seed Oil?
