Extra virgin olive oil is the healthiest oil to cook with. It's the only common cooking oil with meaningful polyphenol content, it's one of the most-studied fats in nutrition research (PREDIMED, Harvard-affiliated cohorts), and — despite its moderate smoke point — it was one of the most oxidatively stable oils under heat in direct laboratory testing. Smoke point alone is a poor predictor of which oil is actually safe to cook with; oxidative stability, processing method, and antioxidant content matter more.
Full disclosure: we're an olive oil company, so we have an obvious preference. We've tried to represent the underlying research fairly below, including findings that complicate our own narrative.
Key Facts
- EVOO produced the lowest polar compound levels of the oils tested when heated to 240°C — 8.47% vs. 22.43% for canola oil (De Alzaa, Guillaume & Ravetti, Acta Scientific Nutritional Health, 2018)
- Smoke point does not predict oil stability under heat — oils with the highest smoke points in the De Alzaa study performed the worst
- EVOO's polyphenols act as natural antioxidants that help protect the oil itself from degrading during cooking
- Coconut oil is roughly 82–92% saturated fat — stable under heat, but raises LDL cholesterol relative to olive oil in randomized trials
- Most seed oils (canola, soybean, corn, sunflower) are chemically extracted using solvents like hexane, then refined, bleached, and deodorized — a process that strips out protective antioxidants
- EVOO is mechanically pressed — no solvents, minimal processing, retains its natural polyphenols
What Is the Healthiest Oil to Cook With?
Based on the available evidence across four criteria — oxidative stability under heat, nutritional profile, processing method, and depth of research backing — extra virgin olive oil ranks highest of any common cooking oil. Most popular oil rankings focus on a single factor (usually smoke point or fatty acid profile) while ignoring how an oil actually performs once you heat it, and how it was made in the first place.
Why Single-Factor Rankings Get It Wrong
Smoke point measures the temperature at which an oil starts visibly smoking — it says nothing about the harmful compounds forming inside the oil before that point. Fatty acid profile tells you about an oil's effect on cholesterol when consumed cold; it says very little about what happens once that oil is heated to frying temperatures, since polyunsaturated fats that are beneficial cold are chemically unstable and prone to oxidation when heated. And processing method matters more than most rankings acknowledge: oils extracted with chemical solvents and then refined, bleached, and deodorized lose most of the protective antioxidants that help an oil resist degradation, compared to oils that are simply mechanically pressed.
Is Olive Oil the Healthiest Cooking Oil?
Yes, by the weight of the evidence across all four criteria:
Oxidative stability: in the De Alzaa et al. (2018) study, extra virgin olive oil produced the lowest final polar compound level of the oils tested — 8.47% ± 1.841 after repeated heating cycles up to 240°C — compared with 22.43% ± 5.609 for canola oil. Its natural antioxidants, including oleocanthal and oleuropein, protect the oil from heat degradation in ways refined oils can't match.
Nutritional profile: EVOO is roughly 73% monounsaturated fat (primarily oleic acid), with meaningful polyphenol content that provides anti-inflammatory and cardiovascular benefit. The De Alzaa study measured EVOO as having roughly 18 times more antioxidant content than canola oil and about 700 times more than coconut oil.
Processing: extra virgin olive oil is mechanically pressed from olives — no chemical solvents, no high heat. "Extra virgin" is a quality grade requiring the oil to meet specific chemical and sensory standards.
Research backing: olive oil has the deepest evidence base of any cooking oil, anchored by the PREDIMED trial (Estruch et al., NEJM, 2018, n=7,447), which found a Mediterranean diet supplemented with EVOO reduced cardiovascular events by roughly 30% versus a control diet.
Can You Fry With Extra Virgin Olive Oil?
Yes. EVOO is commonly used for frying throughout the Mediterranean, and the oxidative-stability data supports it — in the De Alzaa study, it produced fewer harmful polar compounds than canola, sunflower, or rice bran oil even at temperatures up to 240°C (464°F), well above most home frying temperatures. If you want a more neutral flavor at high heat, quality avocado oil (see caveat below) or refined olive oil are reasonable alternatives; high-polyunsaturated seed oils are the ones to avoid for frying, since they degrade fastest and produce the most harmful compounds.
Is the Smoke Point Myth True?
Largely, yes — smoke point is a weak predictor of cooking safety. Four points from the research:
- Smoke point doesn't correlate with harmful compound formation. In the De Alzaa study, the oils with the highest smoke points (canola ~400°F+, sunflower ~440°F) produced the most polar compounds when heated; EVOO, with a lower smoke point around 375°F, produced the fewest.
- Smoke point isn't fixed. It drops as an oil degrades through use, so an oil's advantage on paper may not hold up during extended or repeated cooking.
- Better predictors exist: percentage of polyunsaturated fat (lower is better), level of refinement (less is better), and antioxidant content (higher is better) — none of which is smoke point.
- Typical cooking temperatures sit well below most oils' smoke points anyway — stir-frying runs about 120°C (248°F), deep frying 160–180°C (320–356°F), and oven baking around 200°C (400°F). Even EVOO's ~190°C (375°F) smoke point clears most home cooking applications.
| Oil | Smoke Point (approx.) | Polar Compounds Formed Under Heat (De Alzaa, 2018) | Verdict |
|---|---|---|---|
| Extra Virgin Olive Oil | ~375°F (190°C) | 8.47% — lowest of the oils tested | Most stable despite a moderate smoke point |
| Coconut Oil | ~350°F (177°C) | 9.30% — second-lowest | Stable, but high in saturated fat (see below) |
| Virgin Olive Oil | ~391°F (199°C) | 10.71% | Very good stability, slightly less than EVOO |
| Rice Bran Oil | ~450°F (232°C) | 14.35% | High smoke point, only moderate stability |
| Sunflower Oil | ~440°F (227°C) | 15.57% | High smoke point, weaker stability |
| Canola Oil | ~400°F+ (204°C+) | 22.43% — highest of the oils tested | High smoke point, worst stability under heat |
Polar compound percentages reflect the specific oils tested in De Alzaa, Guillaume & Ravetti (2018); other common oils (avocado, grapeseed, soybean, corn, peanut, sesame) were not part of that specific dataset and are omitted from this table rather than estimated.
Which Cooking Oil Has the Most Polyphenols?
Extra virgin olive oil, by a wide margin, among common cooking oils — it's essentially the only mainstream cooking oil with polyphenol content worth discussing. Refined oils (canola, corn, soybean, sunflower, "light" or refined olive oil) lose the vast majority of their natural antioxidants during solvent extraction and refining. Avocado oil and coconut oil contain some antioxidant compounds but at far lower levels than fresh EVOO.
The Complete Ranking
| Rank | Oil | Antioxidant / Polyphenol Content | Stability Under Heat | Approx. Omega-6:3 Ratio | Processing Method |
|---|---|---|---|---|---|
| 1 | Extra Virgin Olive Oil | High | Excellent | ~10:1 (mostly monounsaturated) | Mechanically pressed |
| 2 | Virgin Olive Oil | Moderate–High | Very good | ~10:1 | Mechanically pressed |
| 3 | Avocado Oil (quality-verified) | Moderate | Good | ~13:1 | Mechanically pressed (verify quality — see below) |
| 4 | Refined / "Light" Olive Oil | Low (stripped in refining) | Good | ~10:1 | Refined |
| 5 | Coconut Oil | Very low | Very good (high saturated fat) | N/A (minimal PUFA) | Mechanically pressed or refined |
| 6 | Peanut Oil | Low | Moderate | ~32:1 | Typically refined |
| 7 | High-Oleic Sunflower Oil | Low | Moderate | Improved vs. conventional, still refined | Refined |
| 8 | Canola Oil | Low | Poor (highest polar compounds in testing) | ~2:1 | Chemically extracted (solvent) |
| 9 | Sunflower Oil (conventional) | Low | Poor | ~40:1+ | Chemically extracted |
| 10 | Corn Oil | Low | Poor | ~50:1+ | Chemically extracted |
| 11 | Soybean Oil | Low | Poor | ~7:1 | Chemically extracted |
| 12 | Grapeseed Oil | Low | Poor | ~700:1 (very high omega-6) | Chemically extracted |
Omega-6:3 ratios are commonly cited approximate figures for each oil category and can vary by source and processing; they're included for general orientation, not laboratory-grade precision.
A Note on Avocado Oil
Avocado oil looks strong on paper — around 70% monounsaturated fat, a high smoke point (~520°F), and a neutral flavor. The catch: research from UC Davis found that a large share of avocado oil products tested were either rancid or adulterated with cheaper oils by the time they reached shelves. If you can't verify quality (third-party-tested brands, clear sourcing), avocado oil's real-world ranking drops significantly — you may be paying a premium for adulterated soybean oil.
A Note on Coconut Oil
Coconut oil's oxidative stability is excellent because it's roughly 82–92% saturated fat — with almost no double bonds to oxidize, it doesn't need antioxidants to resist heat damage the way EVOO does. But a randomized controlled trial (Khaw et al., BMJ Open, 2018) comparing coconut oil, olive oil, and butter found coconut oil raised LDL cholesterol relative to olive oil. It's a reasonably stable cooking fat for occasional use, but not a strong choice as your primary everyday cooking oil if cardiovascular health is a priority.
What Is the Healthiest Oil for Deep Frying?
Extra virgin olive oil performs well here too — its antioxidants continue to protect against degradation even at deep-frying temperatures, and it's the standard frying oil across much of the Mediterranean. If you want a higher smoke point and neutral flavor, quality-verified avocado oil or refined olive oil are reasonable alternatives. High-polyunsaturated seed oils (soybean, corn, sunflower, grapeseed) are the ones to avoid for deep frying specifically — they degrade fastest and produced the most harmful compounds in stability testing.
Practical Cooking Recommendations
- Everyday cooking (sautéing, stir-frying, roasting): extra virgin olive oil
- High heat, neutral flavor needed: quality-verified avocado oil, or refined olive oil as a safer fallback
- Deep frying: EVOO, quality avocado oil, or refined olive oil — avoid high-PUFA seed oils
- Baking: EVOO works well in savory bakes and Mediterranean-style breads; butter or coconut oil for recipes needing a solid fat or specific flavor
- Dressings and finishing: EVOO, without question — this is where its flavor and unheated polyphenols matter most
A simple rule of thumb: use extra virgin olive oil for roughly 80% of your cooking, keep a backup oil (quality avocado or refined olive oil) for the remaining high-heat, neutral-flavor cases, and use butter, ghee, or coconut oil sparingly for specific applications where their flavor or texture matters.
Frequently Asked Questions
What is the healthiest oil to cook with?
Extra virgin olive oil, based on a comprehensive evaluation of oxidative stability under heat, nutritional profile, minimal processing, and depth of research backing — including the PREDIMED trial and direct oil-heating studies.
Is olive oil safe for cooking?
Yes. Laboratory testing found extra virgin olive oil more stable than seed oils when heated, despite its moderate smoke point — producing roughly 2.5 times fewer harmful polar compounds than canola oil at comparable temperatures (De Alzaa et al., 2018).
Can you fry with olive oil?
Yes. EVOO is commonly used for frying in Mediterranean countries, and its antioxidants continue protecting the oil from degradation at deep-frying temperatures.
Is the smoke point myth about olive oil true?
Largely, yes. Research shows the oils with the highest smoke points (canola, sunflower) actually produced the most harmful compounds when heated, while EVOO, with a lower smoke point, produced the fewest. Polyunsaturated fat content, refinement level, and antioxidant content are better predictors of cooking safety than smoke point.
What is the best oil for frying?
Extra virgin olive oil performs well for most frying applications. For higher heat with a neutral flavor, quality-verified avocado oil or refined olive oil are reasonable alternatives; high-polyunsaturated seed oils are the least stable choice for frying.
The Bottom Line
When you evaluate cooking oils on what actually happens when you heat them — not just their fatty acid profile on a label — extra virgin olive oil comes out ahead: strong oxidative stability, a favorable monounsaturated fat profile, minimal processing, and the deepest research base of any cooking oil. Use it for most of your cooking, and don't let smoke point alone drive the decision.
- De Alzaa F, Guillaume C, Ravetti L. "Evaluation of Chemical and Physical Changes in Different Commercial Oils During Heating." Acta Scientific Nutritional Health, 2018;2(6):2–11.
- Estruch R, Ros E, Salas-Salvadó J, et al. "Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts." New England Journal of Medicine, 2018;378:e34. n=7,447.
- Khaw KT, Sharp SJ, Finikarides L, et al. "Randomised Trial of Coconut Oil, Olive Oil or Butter on Blood Lipids and Other Cardiovascular Risk Factors in Healthy Men and Women." BMJ Open, 2018;8(3):e020167.
- UC Davis Olive Center. Avocado Oil Quality and Authenticity Testing.
- American Heart Association. Dietary Fats and Cardiovascular Disease position statement.
Related Reading
- Is Olive Oil a Seed Oil? The Botanical Truth
- Mediterranean Diet Olive Oil
- Polyphenols in Olive Oil
- Oleocanthal Benefits: Olive Oil's Anti-Inflammatory Compound
- Avocado Oil vs Olive Oil: Which Is Really Better?
- Coconut Oil vs Olive Oil
Note: the previous version of this page used an anchored table of contents (#why-rankings-wrong, #complete-ranking, #four-criteria, etc.), which Google was indexing as separate fragment URLs and diluting this page's authority. This version removes those anchor IDs and the jump-link table of contents entirely — do not re-add fragment links when publishing.
