Walk through almost any health-focused grocery store today, and you will see avocado oil and extra virgin olive oil marketed as premium “healthy fats.” For years, these oils have been promoted as staples of a wellness-focused kitchen thanks to their antioxidant content, healthy fatty acid profiles, and connection to traditional diets like the Mediterranean diet.
But recently, a different conversation has started gaining traction in the low-tox and ancestral health world: should these oils actually be heated at all?
More people are beginning to question whether cooking with avocado oil and olive oil may damage the very compounds that make them beneficial in the first place. The concern centers around oxidation, heat stability, and the formation of degraded fats during cooking.
The argument is not necessarily that olive oil or avocado oil is “bad.” In fact, both oils contain beneficial nutrients and bioactive compounds. The bigger question is whether high heat changes those oils enough that they are no longer the best option for frying, roasting, sautéing, or grilling.
For many people trying to build a more intentional kitchen, this discussion has shifted from trends to understanding how fats behave under heat.
What Happens to Oils When They Are Heated?
When cooking oils are exposed to heat, oxygen, and light, they begin to undergo chemical changes. One of the most important of these changes is oxidation.
Oxidation occurs when fats react with oxygen, forming unstable compounds. During this process, oils can lose some of their beneficial antioxidants and polyphenols while potentially generating harmful byproducts such as aldehydes and lipid peroxides.
The degree to which this happens depends on several factors:
- The type of fat in the oil
- The temperature used
- The duration of cooking
- Exposure to air and light
- How refined or processed the oil is
Polyunsaturated fats are generally the most unstable under heat because their chemical structure contains multiple double bonds that are vulnerable to oxidation. Saturated fats tend to be much more stable because their structure is more resistant to breakdown.
Monounsaturated fats, like those found in olive oil and avocado oil, fall somewhere in the middle. They are more stable than highly processed seed oils but still susceptible to degradation under certain cooking conditions.
The Confusion Around Smoke Point
One reason avocado oil became so popular is its high smoke point. Smoke point is the temperature at which an oil begins to smoke visibly in the pan.
For years, people assumed that a higher smoke point automatically meant an oil was healthier and more stable for cooking. But researchers now note that the smoke point alone does not tell the full story.
An oil can have a high smoke point while still undergoing oxidation and nutrient degradation before visible smoke appears. This is an important distinction because many of the beneficial compounds in oils, including antioxidants and polyphenols, can begin deteriorating at temperatures below the smoke point.
Extra virgin olive oil, for example, contains valuable polyphenols that contribute to its anti-inflammatory and antioxidant properties. Repeated heating or prolonged exposure to high temperatures may reduce those compounds significantly over time.
Avocado oil faces similar concerns. While it contains monounsaturated fats and vitamin E, heating may still alter some of its beneficial components, especially during high-temperature cooking methods like deep frying or grilling.
Why Stable Fats Are Making a Comeback
As more people become interested in traditional cooking methods and low-tox eating habits, there has been renewed interest in fats that are naturally more heat-stable.
These include:
- Grass-fed butter
- Ghee
- Organic coconut oil
- Beef tallow
The primary reason these fats are favored for cooking is their fatty acid composition. Saturated fats are much less prone to oxidation at high temperatures than are fragile polyunsaturated oils.
That does not automatically make them perfect foods, but from a heat-stability standpoint, they tend to hold up better during cooking.
Grass-Fed Butter: More Than Just a Traditional Fat
Butter was unfairly demonized for decades during the low-fat era, but many people are now reevaluating traditional animal fats through a different lens.
Grass-fed butter contains fat-soluble vitamins, such as vitamin A and vitamin K2, as well as butyrate, a short-chain fatty acid that has been studied for its potential role in gut health.
While butter does contain some delicate milk solids that can burn at high temperatures, it generally performs well for moderate-heat cooking. Many people also prefer butter because it is minimally processed compared to industrial oils.
Choosing grass-fed butter may offer a slightly more favorable nutrient profile, including higher omega-3 content and higher levels of conjugated linoleic acid than conventional butter.
Ghee: The High-Heat Version of Butter
Ghee is essentially clarified butter with the milk solids removed. This process gives it a much higher heat tolerance than regular butter while preserving many of the same rich flavors.
Because the proteins and sugars have been removed, ghee is less likely to burn during cooking. This makes it popular for roasting, sautéing, and pan-frying.
Ghee has been used for centuries in traditional cooking systems, particularly in Indian cuisine and Ayurvedic practices. Many people appreciate that it provides a buttery flavor with greater cooking stability.
Another advantage is that some individuals who are sensitive to dairy proteins tolerate ghee more easily because most of the lactose and casein have been removed during processing.
Coconut Oil: Stable but Polarizing
Organic coconut oil remains one of the most debated fats in modern nutrition conversations. Critics often focus on its saturated fat content, while supporters emphasize its stability and traditional use in tropical cultures.
From a cooking perspective, coconut oil is relatively resistant to oxidation because it is composed primarily of saturated fats. This makes it well-suited for higher-heat applications.
Coconut oil also contains medium-chain triglycerides, or MCTs, which are metabolized differently than many other fats. Some people find coconut oil particularly useful for baking, roasting vegetables, or cooking at medium to high temperatures.
The flavor can be noticeable depending on the type used. Refined coconut oil has a more neutral taste, while unrefined versions retain a stronger coconut aroma.
Tallow: The Traditional Cooking Fat Returning to Modern Kitchens
Before industrial seed oils became widespread, many restaurants and households cooked with animal fats, such as tallow. Beef tallow is highly stable at high temperatures due to its fatty acid composition and has recently experienced a resurgence among people interested in ancestral nutrition and traditional cooking methods.
Tallow works especially well for frying and roasting because it tolerates high temperatures without breaking down as quickly as many vegetable oils.
Supporters of tallow also argue that it is less processed than many modern oils. When sourced from grass-fed animals, it may also contain fat-soluble vitamins and beneficial fatty acids.
For people trying to reduce reliance on heavily refined industrial oils, tallow represents a return to older cooking traditions that existed long before highly processed seed oils dominated supermarket shelves.
Should Olive Oil and Avocado Oil Be Avoided Completely?
Not necessarily.
This conversation is often oversimplified online into “good oils” versus “bad oils,” but the reality is much more nuanced. Olive oil and avocado oil still contain beneficial compounds and can absolutely have a place in a health-conscious kitchen.
The bigger consideration may be how they are used.
Many low-tox cooks now prefer using extra virgin olive oil and avocado oil for lower-heat applications such as:
- Salad dressings
- Dipping sauces
- Drizzling over cooked foods
- Homemade marinades
- Finishing vegetables or meats after cooking
Using these oils raw or after cooking may help preserve more of their delicate antioxidants and polyphenols.
Meanwhile, more heat-stable fats like butter, ghee, coconut oil, and tallow are often reserved for high-temperature cooking methods.
The Bigger Problem May Be Highly Processed Seed Oils
One reason this conversation around avocado oil and olive oil has intensified is that many people are reevaluating the broader role of industrially processed seed oils in the modern diet.
Highly refined oils such as soybean oil, corn oil, canola oil, cottonseed oil, and sunflower oil are often heavily processed, deodorized, and exposed to high heat during manufacturing before they even reach the kitchen.
These oils are rich in polyunsaturated fats, which are particularly vulnerable to oxidation during both processing and cooking.
For many people focused on low-tox living, reducing consumption of heavily processed seed oils has become a more immediate priority than obsessing over whether olive oil should ever be heated in a hot pan.
Building a More Intentional Kitchen
Creating a healthier kitchen is more about understanding how ingredients behave and making practical choices that align with long-term goals.
Many people are now moving toward a simpler approach:
- Use stable fats for high-heat cooking
- Use delicate oils, raw or lightly heated
- Reduce heavily processed industrial oils
- Focus on minimally processed whole-food ingredients whenever possible
That shift often leads to a kitchen that feels less dependent on ultra-processed products and more connected to traditional cooking practices that prioritized stability, simplicity, and nutrient density long before modern food marketing complicated the conversation around fats.
References:
- Abdollahi, S., Soltani, S., Ramezani-Jolfaie, N., Mohammadi, M., Sherafatmanesh, S., Lorzadeh, E., & Salehi-Abargouei, A. (2024). The effect of different edible oils on body weight: a systematic review and network meta-analysis of randomized controlled trials. BMC Nutrition, 10(1), 107.https://doi.org/10.1186/s40795-024-00907-0
- DiNicolantonio, J. J., & O’Keefe, J. H. (2017). Good fats versus bad fats: A comparison of fatty acids in the promotion of insulin resistance, inflammation, and obesity. Missouri Medicine, 114(4), 303–307.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6140086/
- Serreli G, Boronat A, De la Torre R, Rodriguez-Moratò J, Deiana M. Cardiovascular and Metabolic Benefits of Extra Virgin Olive Oil Phenolic Compounds: Mechanistic Insights from In Vivo Studies. Cells. 2024;13(18):1555. doi: 10.3390/cells13181555. PMID: 39329739; PMCID: PMC11430205.
