We’ve All Been There
You’re cooking dinner, the pan gets a bit too hot, the oil starts to smoke, and the smoke alarm goes off. You wave a tea towel at the ceiling, crack a window, and keep cooking.
It tastes a bit off, but nothing dramatic happens. So you move on.
At the same time, you keep hearing people talk about smoke point, flash point, burn point — usually online, usually with charts and bold claims. Some oils are praised, others are demonised.
It’s easy to think:
How bad can a bit of smoke really be?
And does any of this actually matter in real life?
The answer is yes — but not in the way it’s often presented.
What These Terms Actually Mean (In Plain English)
Let’s clear the terminology up properly.
Smoke point is the temperature at which an oil begins to visibly smoke. At this point, the oil is breaking down chemically.
Flash point is the temperature at which vapours from an oil can briefly ignite if exposed to flame.
Burn point is when the oil can sustain combustion.
For home cooking, smoke point is the only one that matters. Flash and burn points are safety metrics, not cooking or nutrition metrics. If you’re hitting those temperatures, the problem isn’t oil choice.
So What Actually Happens When Oil Smokes?
When oil is heated beyond its smoke point, several things occur at a molecular level:
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triglycerides begin to degrade
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free fatty acids increase
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antioxidants are destroyed
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lipid oxidation accelerates
More importantly, reactive aldehydes are formed.
Multiple peer-reviewed studies have shown that repeatedly heating oils high in polyunsaturated fats produces significantly higher levels of toxic aldehydes than oils dominated by monounsaturated fats.
Key references:
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Grootveld et al., Scientific Reports, 2015 — analysis of aldehyde formation in heated cooking oils
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Choe & Min, Journal of Food Science, 2006 — mechanisms of lipid oxidation during frying
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Guéraud et al., Molecular Nutrition & Food Research, 2010 — biological effects of lipid peroxidation products
These aldehydes are biologically active compounds associated with oxidative stress and cellular damage when consumed regularly.
This is why overheating oil is not just a flavour issue.
Why High Smoke Point Oils Aren’t Automatically Better
This is where a lot of confusion comes in.
Many refined oils boast very high smoke points. And to be fair, they are genuinely better at tolerating extreme heat.
Refining removes:
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free fatty acids
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waxes
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phospholipids
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plant solids
This delays smoking and pushes smoke points higher.
Typical examples:
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refined avocado oil: ~250–270°C
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refined canola oil: ~230–240°C
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refined sunflower oil: ~230°C
From a heat tolerance perspective, these oils perform well.
But refining also removes natural antioxidants, and if the oil is high in omega-6 polyunsaturated fats, oxidation can still occur rapidly under heat.
High smoke point does not mean low oxidation.
Poor Performers That Catch People Out
Some oils are commonly used outside their ideal range:
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Butter
Smoke point ~150°C
Milk solids burn quickly and form acrolein -
Unrefined walnut oil
Smoke point ~160°C
High polyunsaturated fat content, oxidises easily -
Flaxseed oil
Smoke point ~107°C
Not suitable for cooking at all -
Extra virgin olive oil
Smoke point typically 160–190°C depending on quality
Stable for moderate cooking, not ideal for sustained high heat
None of these are “bad oils”. They’re just often misused.
Where Macadamia Oil Fits (Scientifically)
Unrefined, cold-pressed macadamia oil typically has a smoke point around 190–200°C.
More importantly, its fat composition is approximately:
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78–80% monounsaturated fat
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2–4% omega-6 polyunsaturated fat
This matters.
Studies comparing heated oils show that monounsaturated-dominant oils generate fewer harmful oxidation products than polyunsaturated-dominant oils at similar temperatures.
Key references:
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Frankel, Lipid Oxidation, 2012
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Shahidi & Zhong, Journal of Functional Foods, 2015
In practical cooking conditions, macadamia oil holds its structure well without needing heavy refining.
What About Very High Heat Cooking?
If you’re genuinely cooking at very high temperatures for short periods — hard searing, repeated frying — refined avocado oil is a sensible choice.
Especially when:
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it is Australian produced
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used intentionally rather than as a default
Avocado oil combines a high smoke point with a predominantly monounsaturated fat profile, making it a better high-heat option than refined vegetable oils high in omega-6 fats.
Bringing This Back to Real Life
Most home cooking happens below 200°C.
Roasting vegetables
Pan frying fish or chicken
Sautéing aromatics
Grilling seafood
Barbecuing
In these scenarios, an oil that balances:
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sufficient smoke point
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oxidative stability
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low omega-6 content
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minimal processing
is often the smarter choice than chasing the highest number on a chart.
Why Local and Unprocessed Still Matter
Fancy Farmer macadamia oil is:
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cold pressed
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unrefined
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grown and produced in Australia
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made from a native crop
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supplied through a short, transparent chain
Shorter supply chains reduce oxidation before use. Less processing preserves natural structure. Knowing where your oil comes from matters just as much as how hot it can get.
This is not about perfection. It’s about sensible choices that fit real kitchens and real lives.
The Bottom Line
Smoke point matters.
Overheating oils matters.
Oxidation matters.
But context matters most.
The goal isn’t the highest possible temperature.
It’s stability at the temperatures you actually cook at.
Macadamia oil doesn’t need to be everything.
It just needs to be used where it performs best.