Healthy Cooking Oils: What to Actually Cook With (and What’s Been Falsely Accused)

By Lynn Peterson, D.Sc., M.S., Certified Health Coach Health educator and host of Health News & Views

A quick disclosure before we start: I’m a certified health coach and health educator — not a physician or a registered dietitian. Everything below is pulled from named, cited research and government guidance, not my personal ranking of what’s healthy. Treat it as homework to bring to your own doctor or dietitian, not a prescription. That’s not boilerplate to me — it’s the whole “just the messenger” thing.

You remember the blue can of grease by the stove. The lard that made the flakiest biscuits. Butter cascading down a mountain of mashed potatoes. Then, seemingly overnight, it was all declared a crime scene, and corn oil, margarine, and “I Can’t Believe It’s Not Butter” moved in. Decades later, we’re still sorting out what that oil change actually cost us — and what to put in the pan tonight. Let’s start with tonight.

Healthy cooking oils at a glance

Oil	Best use	Heat level	Saturated fat	Verdict
Extra-virgin olive oil	Sautéing, roasting, dressings	Low–medium (some products tolerate higher)	Low	Best general-purpose choice; strongest cardiovascular evidence [1][6]
Refined avocado oil	Searing, high-heat roasting	High (~500°F+)	Low–moderate	Neutral flavor, highest smoke point of the group [6]
Canola oil	Baking, general cooking	Medium–high	Low	Low in saturated fat; omega-6 content is part of the debate below [1]
Flaxseed / walnut oil	Dressings only	No heat	Low	Good omega-3 source; refrigerate, oxidizes fast
Coconut oil	Occasional baking/flavor	Medium	Very high (~90%)	See “Both sides” section below [7]
Butter / ghee	Flavor, occasional cooking	Varies	High	See “Both sides” section below
Lard (pasture-raised)	Occasional cooking	Medium	High	See “Both sides” section below
Avoid	—	—	—	Partially hydrogenated oils, rancid oil, reused deep-frying oil

The short answer, if you’re standing in the kitchen right now: reach for extra-virgin olive oil most days, keep a bottle of refined avocado oil for high heat, save flaxseed or walnut oil for dressings, and treat coconut oil, butter, ghee, and lard as flavor players in limited amounts rather than everyday defaults — for reasons that are genuinely debated, not because anyone’s hiding something from you. Let’s get into it.

So what about butter, lard, ghee, and coconut oil?

This is the one place I want to show you both sides plainly, because they don’t agree, and pretending they do would be dishonest.

What mainstream cardiology says. The American Heart Association recommends cooking with nontropical liquid oils — olive, canola, corn, peanut, safflower, soybean, sunflower — instead of butter, lard, shortening, and tropical oils like palm and coconut, and it wants saturated fat capped at under 4 grams per tablespoon [1]. Cleveland Clinic’s Julia Zumpano, RD, LD, puts it plainly: virgin coconut oil runs about 92% saturated fat — more than butter — and she recommends using it in moderation rather than as a daily cooking oil [7]. This is the position most cardiologists and the AHA’s 2021 dietary fat guidance still hold [6].

What the traditional-foods camp argues. A 2010 meta-analysis of 21 prospective cohort studies by Siri-Tarino and colleagues, published in the American Journal of Clinical Nutrition, found no statistically significant association between saturated fat intake alone and cardiovascular disease risk [2] — a finding that reignited this whole debate. Dr. Andrew Weil has argued lard, in moderation, is largely monounsaturated fat and not the villain it was made out to be [8]. The traditional-foods argument also points to LDL particle size: large, buoyant LDL particles are less strongly linked to arterial plaque than the small, dense particles that refined carbohydrates are now understood to drive — a distinction the original low-fat guidance didn’t make [3].

Where that leaves you. Both things can be true at once: saturated fat’s relationship to heart disease is more nuanced than “clogs your arteries,” and the AHA, Cleveland Clinic, and most practicing cardiologists still recommend limiting it and reaching for unsaturated oils as your everyday default. That second part is well-established guidance, not a fringe opinion — the particle-size nuance is accumulating science, not settled science that overturns it. If you eat butter or lard, you’re not committing a crime. If you’re cooking with them every night in place of olive or avocado oil, that’s the part worth a conversation with your own doctor, especially if you have existing cardiovascular risk.

Follow the money. One more fact worth having before you decide how much weight to put on “AHA-approved”: food companies pay the American Heart Association an annual licensing fee — reported at $3,000 to $6,000 per product, scaled to the company’s revenue — for the right to put its Heart-Check mark on a package, and that payment isn’t disclosed to you as the shopper [13]. It’s led to a string of class-action lawsuits over undisclosed paid endorsement, including one challenging Heart-Check-labeled red meat products even though AHA’s own general guidance urges limiting red meat [13]. None of that makes the underlying science wrong on its own. But “heart healthy” on a box is a paid credential, not a neutral verdict, and you’re allowed to weigh it accordingly.

Are seed oils secretly the enemy? A “guilty by association” case

Soybean, corn, cottonseed, and generic “vegetable oil” have been getting a lot of side-eye lately, and some of it is deserved — but let’s separate what’s proven from what’s still theory, because right now these get lumped together and they shouldn’t be.

Case for the prosecution: the modern diet runs an omega-6-to-omega-3 ratio of roughly 15:1 to 20:1, well above the 4:1 or lower ratio associated with better outcomes in one widely cited review [4]. Polyunsaturated oils also have lower smoke points and oxidize more readily under high heat, especially when reused.

Case for the defense: the AHA’s 2024 advisory states there’s no reason to avoid seed oils and several reasons to eat them, pointing to human outcome data rather than lab mechanisms [9]. Cleveland Clinic’s own review of the “seed oils are toxic” claim concludes the oils themselves aren’t the problem — their prevalence in ultra-processed food, and how many times they get reheated, is [10].

The verdict, honestly: these are four different claims wearing the same trench coat, and they don’t have the same evidence behind them.

1. Industrial trans fat is harmful — settled.
2. Repeatedly heating and reusing oil is undesirable — settled.
3. Ultra-processed food is associated with poor health outcomes — well-established.
4. All seed oils are inherently inflammatory or harmful in normal cooking amounts — contested, mechanistic evidence only, not confirmed in human outcomes.

It’s not the oil — it’s what we do to it, and how much of it arrives already baked into a bag of something else. Cold-pressed, high-oleic, and heavily refined versions of the same oil also behave differently, so “seed oil” as one uniform villain doesn’t hold up the way a detective-show ending wants it to.

Where trans fats still hide

Trans-fat warning: avoid anything listing “partially hydrogenated oil.” The FDA completed a phaseout of partially hydrogenated oils from the U.S. food supply by 2020, and the WHO has pushed the same globally [5][11] — so this is largely a solved problem in U.S.-manufactured food today. It can still turn up in older stock or some imported products, so it’s worth a label check, but it’s no longer the main event for anyone shopping in a U.S. grocery store in 2026.

Cooking-method cheat sheet

• Baking: canola or a neutral refined oil; butter or ghee for flavor in moderation.
• Oven roasting: avocado oil or olive oil, depending on temperature.
• Stir-frying / searing: refined avocado oil — highest smoke point of the group.
• Sautéing: extra-virgin olive oil at low-to-medium heat.
• Dressings and marinades (no heat): extra-virgin olive, flaxseed, or walnut oil.
• “Light” olive oil refers to flavor and color, not fewer calories or less fat — it’s simply more refined.
• When oil starts smoking, it’s breaking down; toss it and start over rather than pushing through.
• Don’t reuse deep-frying oil repeatedly — each use adds oxidation.
• Rancid oil smells faintly like crayons or paint; if it smells “off,” it is.
• Store oil in a cool, dark place, tightly capped, and buy a size you’ll finish in a few months rather than a jug that sits half-used for a year.

Why cooking-oil advice got so confusing in the first place

Quick history, promise. In 1955, President Eisenhower suffered a very public heart attack. He’d also been a four-pack-a-day cigarette smoker for decades before quitting cold turkey in 1949 — six years before that heart attack, and a confounder that rarely gets mentioned in the same breath as “he liked rich food” [14].

Around the same time, researcher Ancel Keys was building the case that saturated fat, not smoking or sugar, was the primary driver of heart disease. His earliest version of that case, a 1953 presentation, plotted six countries and showed a striking near-perfect line between fat intake and heart disease. But data existed for far more countries than that.

When researchers Yerushalmy and Hilleboe re-ran the numbers in 1957 using all 22 countries with FAO and WHO data on hand, the correlation weakened substantially [15]. Keys’s later, formal Seven Countries Study (1958–1970) drew its own separate methodological criticism over how its populations were selected — a point even Henry Blackburn, one of the study’s own lead investigators, acknowledged in his own writing on the study’s history [16]. None of that proves saturated fat is harmless. It does mean the foundational case against it was built on a narrower, more selectively framed slice of the data than most people were ever told, and that guidance is also what pushed Americans toward the partially hydrogenated oils discussed above — the actual, unambiguous villain of this whole story, now largely regulated out of the food supply.

The lesson isn’t that fat itself is dangerous — it’s that swapping it wholesale for refined carbohydrates, which is what many people actually did, may have traded one problem for another [3]. And it’s worth asking, every time a health authority hands down a verdict: who reviewed the data, who funded it, and who profits from you believing it. That’s not cynicism. That’s due diligence — and it’s exactly what “just the messenger” means.

So what now

1. Check your pantry for “partially hydrogenated oil” on any label — rare in 2026, but check anyway.
2. Use the chart above instead of memorizing rules. Olive and avocado oil for most cooking, flaxseed or walnut for dressings, butter/ghee/lard/coconut oil as occasional flavor, not daily defaults.
3. Don’t reuse or overheat oil — that’s the one place the evidence is unanimous.
4. Ask your doctor for a full lipid panel — total cholesterol alone tells you less than LDL particle type, HDL, and triglycerides.
5. Hold two ideas at once: the saturated-fat conversation is more nuanced than it used to be, and mainstream cardiovascular guidance still says reach for unsaturated oil most of the time. Both are true.

Medical disclaimer: This article is for general informational and educational purposes only. It is not medical advice and doesn’t replace a conversation with a licensed physician or registered dietitian. Dietary fat recommendations vary by individual health status — talk to your doctor before making significant changes, especially if you have cardiovascular disease, diabetes, or high cholesterol.

The oil change of the 20th century was made with good intentions and incomplete data. This one should be made with better sourcing, a label you actually read, and a question or two for your own doctor. I’m just sayin’.

Sources & Further Reading

1. American Heart Association. Healthy Cooking Oils. heart.org — https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/fats/healthy-cooking-oils
2. Siri-Tarino, P.W., et al. (2010). Meta-analysis of prospective cohort studies evaluating the association of saturated fat with cardiovascular disease. American Journal of Clinical Nutrition, 91(3), 535–546. https://doi.org/10.3945/ajcn.2009.27725
3. Chowdhury, R., et al. (2014). Association of dietary, circulating, and supplement fatty acids with coronary risk. Annals of Internal Medicine, 160(6), 398–406. https://doi.org/10.7326/M13-1788
4. Simopoulos, A.P. (2016). An increase in the omega-6/omega-3 fatty acid ratio increases the risk for obesity. Nutrients, 8(3), 128. https://doi.org/10.3390/nu8030128
5. U.S. FDA. (2018). Final Determination Regarding Partially Hydrogenated Oils. https://www.fda.gov/food/food-additives-petitions/final-determination-regarding-partially-hydrogenated-oils
6. American Heart Association. (2021). Dietary Fats and Cardiovascular Disease. https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/fats/dietary-fats
7. Cleveland Clinic / Julia Zumpano, RD, LD. Choosing and Using Cooking Oils: What to Use and When. https://health.clevelandclinic.org/how-to-choose-and-use-healthy-cooking-oils
8. Weil, A. Is Lard Healthy? https://www.drweil.com/diet-nutrition/nutrition/is-lard-healthy/
9. American Heart Association. (2024). There’s No Reason to Avoid Seed Oils and Plenty of Reasons to Eat Them. https://www.heart.org/en/news/2024/08/20/theres-no-reason-to-avoid-seed-oils-and-plenty-of-reasons-to-eat-them
10. Cleveland Clinic / Julia Zumpano, RD, LD. Seed Oils: Are They Actually Toxic? https://health.clevelandclinic.org/seed-oils-are-they-actually-toxic
11. WHO. (2023). Eliminating Industrially-Produced Trans Fats. https://www.who.int/news-room/questions-and-answers/item/nutrition-trans-fat
12. Keys, A. (1970). Coronary heart disease in seven countries. Circulation, 41(4 Suppl), I1-211. https://doi.org/10.1161/01.CIR.41.4S1.I-1
13. Truth in Advertising. (2018). Heart-Healthy Certification: The Price is the Right. https://truthinadvertising.org/articles/aha-certified-brands-challenged-for-failing-to-disclose-paid-endorsement/
14. Messerli, F.H., & Messerli, A.W. (2009). Eisenhower’s 1955 heart attack: medical treatment and political effects. PubMed. https://pubmed.ncbi.nlm.nih.gov/19213302/
15. Yerushalmy, J., & Hilleboe, H.E. (1957). Fat in the diet and mortality from heart disease: a methodologic note. New York State Journal of Medicine, 57, 2343–2354. https://pubmed.ncbi.nlm.nih.gov/13441073/
16. Seven Countries Study. Henry Blackburn — investigator biography and study history. https://www.sevencountriesstudy.com/about-the-study/investigators/henry-blackburn/

About the Author

Lynn Peterson (“Lynn Pete”) is an instructor, writer, researcher, and health and nutrition blogger who describes herself as “just the messenger.” She hosts the Health News & Views: Food the Final Frontier podcast, dedicated to bringing clarity to the health disparities in Black and brown communities. She holds a B.A. in English/Communications and M.S. and D.Sc. degrees in Education, and is a Certified Post-Secondary Instructor and Certified Health Coach. Her book, Food: The Final Frontier — The Plain Truth About Food, Chronic Disease & Health in Black & Brown Communities, arrives September 2026.

⚕️ MEDICAL DISCLAIMER

This article is for general informational and educational purposes only. It does not constitute medical advice and should not replace consultation with a licensed physician or qualified healthcare provider. The author is a Certified Health Coach, not a licensed medical doctor. Dietary fat recommendations vary by individual health status. Always consult your doctor or a registered dietitian before making significant changes to your diet, particularly if you have cardiovascular disease, diabetes, or high cholesterol.