The Best Oil for Cooking (and Why You've Been Overthinking It)

Every grocery store has an entire aisle of cooking oils. Olive, avocado, coconut, sesame, grapeseed, canola. You stand there reading labels, trying to remember which one your doctor mentioned and which one the internet told you would kill you.

The best oil for cooking is simpler than it seems. And recent research has upended some of the old rules about which oils belong on your stovetop.

Which Oil Is Best for Everyday Cooking?

Extra virgin olive oil. That's the short answer.

For decades, home cooks heard that olive oil couldn't handle high heat. The advice was to save it for salad dressings and use something with a higher smoke point for the stove. But a 2018 study published in Acta Scientific Nutritional Health tested ten common cooking oils at high temperatures and found that extra virgin olive oil produced the fewest harmful compounds of any oil tested. It outperformed canola, grapeseed, coconut, avocado, peanut, rice bran, and sunflower oils.

The reason comes down to chemistry. Olive oil is high in monounsaturated fats and contains natural antioxidants called polyphenols. Both help the oil resist breaking down under heat. Smoke point, the old metric everyone used to judge cooking oils, turned out to be a poor predictor of how an oil actually performs. Oxidative stability matters more, and olive oil has plenty of it.

A 2022 study from Harvard T.H. Chan School of Public Health tracked over 92,000 adults for 28 years. People who consumed more than half a tablespoon of olive oil per day had a 19% lower risk of cardiovascular mortality compared to those who rarely consumed it. Replacing butter or margarine with olive oil was associated with an 8% to 34% lower risk of death from all causes. The study was published in the Journal of the American College of Cardiology.

Teresa Fung, adjunct professor in the Department of Nutrition at the Harvard T.H. Chan School of Public Health, has noted that most stovetop cooking stays well below 350 degrees Fahrenheit. That's comfortably under olive oil's smoke point of 365 to 410 degrees. You would need to be deep-frying to approach that range.

Best Oil for High Heat Cooking

When you need to sear, stir-fry, or roast above 400 degrees, avocado oil is the strongest option. Refined avocado oil has a smoke point between 470 and 500 degrees Fahrenheit. It's also high in monounsaturated fat, giving it good thermal stability at those temperatures.

But there's a catch. A 2020 study from the University of California, Davis found that 82% of avocado oil sold in the United States was either rancid before its expiration date or adulterated with cheaper oils like soybean oil. Some bottles labeled "extra virgin" or "pure" contained almost no avocado oil at all. A follow-up study in 2023 found similar problems, with nearly 70% of private label avocado oils failing quality tests.

The issue is that the FDA has not established standards of identity for avocado oil. Without enforceable regulations, there's no mechanism to stop manufacturers from selling mislabeled products. Selina Wang, the UC Davis researcher who led both studies, has been working with the American Oil Chemists' Society to develop standards, but they aren't in place yet.

If you buy avocado oil, look for brands that were verified in the UC Davis research. Store it in a cool, dark place and use it before the date on the bottle. Virgin avocado oil should be green. Refined avocado oil should be light yellow and nearly clear. If it smells like Play-Doh, it's rancid.

Best Oils for Flavor

Some oils exist to do a specific job, and that job is flavor.

Toasted sesame oil is one of the oldest culinary oils in the world. Sesame has been cultivated since the Bronze Age, first in the Indus Valley and later across East Asia, the Middle East, and Africa. Toasted sesame oil has a low smoke point (around 350 degrees) and a strong nutty taste. It's best added at the end of cooking or used in dressings and marinades. A few drops can transform a bowl of rice, a stir-fry, or a cold noodle dish.

Sesame oil contains natural antioxidants called lignans – sesamin, sesamol, and sesamolin – that help protect the oil from rancidity and may offer anti-inflammatory benefits, according to research published in Frontiers in Nutrition.

Unfiltered extra virgin olive oil works as both a cooking oil and a finishing oil. High-quality EVOO has a peppery, grassy bite that complements vegetables, bread, grains, and fish. That peppery sensation comes from oleocanthal, a polyphenol compound with documented anti-inflammatory properties.

Ghee (clarified butter) is traditional in South Asian cooking. Removing the milk solids from butter raises the smoke point to around 450 degrees and gives the fat a rich, caramelized flavor. Ghee works well for searing, roasting, and sautéing spices. It is higher in saturated fat than plant oils, so it's best used as a flavor ingredient rather than a primary cooking fat.

What About Coconut Oil?

Coconut oil became popular in the 2010s with claims that its medium-chain fatty acids made it a health food. The science doesn't support regular use.

A 2020 meta-analysis published in the journal Circulation reviewed 16 clinical trials and found that coconut oil significantly increased LDL cholesterol (the kind linked to heart disease) by about 10.5 mg/dL compared to other vegetable oils. It also raised HDL cholesterol by about 4 mg/dL, but increasing HDL alone has not been shown to reduce cardiovascular risk.

The American Heart Association has advised against using coconut oil as a regular cooking fat since 2017. About 82% of the fat in coconut oil is saturated. One tablespoon contains roughly 12 grams of saturated fat, which is close to the AHA's recommended daily limit of 13 grams for a 2,000-calorie diet.

Harvard's Nutrition Source puts it plainly: coconut oil should not be viewed as a heart-healthy food. It can be used sparingly for flavor or texture in specific recipes – it works well in certain curries and baked goods – but it shouldn't replace olive or avocado oil as your daily cooking fat.

Smoke Points Are Less Important Than You Think

The cooking oil conversation has focused on smoke points for years. But research from the last decade has shifted the focus to oxidative stability, which measures how well an oil resists chemical breakdown when heated.

An oil with a high smoke point can still produce harmful compounds at lower temperatures if it's rich in polyunsaturated fats. Canola oil has a smoke point around 400 degrees, but in the 2018 Acta Scientific study, it produced more than 2.5 times the polar compounds (a marker of chemical degradation) that extra virgin olive oil did.

What actually predicts oil stability under heat is a combination of factors: the percentage of monounsaturated fat (higher is better), the level of natural antioxidants, and how much the oil has already been processed during refining. Extra virgin olive oil scores well on all of these measures because it's minimally refined and naturally rich in protective compounds.

That doesn't mean smoke point is meaningless. If your oil is smoking in the pan, it's breaking down and you should start over. But choosing an oil purely because it has the highest smoke point number is the wrong approach.

The Two-Bottle Kitchen

You can cook almost anything with two oils.

Extra virgin olive oil covers sautéing, roasting, baking, dressings, and finishing. It works for eggs in the morning, vegetables at dinner, and vinaigrettes on the weekend. Buy the freshest bottle you can find and use it within a few months of opening. Look for a harvest date on the label if possible.

A high-heat neutral oil covers the rare occasions when you need to go above 450 degrees or want a completely neutral flavor. Refined avocado oil works if you can find a reputable brand. Light (refined) olive oil is another option. It has a higher smoke point than extra virgin (around 470 degrees) and a neutral taste.

If you cook a lot of East Asian food, add a small bottle of toasted sesame oil as your third. If you cook South Asian food regularly, keep some ghee around.

That's four oils at most. Everything else is optional.

How to Store Cooking Oil

Oil degrades with exposure to light, heat, and air. Keep bottles in a cool, dark cabinet rather than next to the stove. Use oil within a few months of opening.

The American Heart Association recommends buying smaller bottles if you don't cook frequently. If your oil smells stale or off, throw it out. Don't reuse cooking oil, especially after frying. A 2018 study cited in the Acta Scientific research found that toxic byproducts in polyunsaturated oils increased tenfold after just 30 minutes of heating.

Dark glass bottles protect oil from light degradation better than clear plastic. If your olive oil came in a tin, that's even better.

The Bottom Line

The best oil for cooking is extra virgin olive oil for most tasks, with avocado oil reserved for very high heat. Coconut oil is fine occasionally for flavor but shouldn't be a staple. Specialty oils like toasted sesame oil and ghee earn their place when you're cooking specific cuisines.

The research consistently points in one direction: prioritize oils high in monounsaturated fats and natural antioxidants, buy from reputable sources, and store them properly.

Everything else is just noise in the grocery aisle.