Macadamia nut oil is one of the healthiest cooking oils available, thanks to a fat profile that rivals and in some ways surpasses olive oil. Over 80% of its fat is monounsaturated, the type consistently linked to better cholesterol levels and lower heart disease risk. At 130 calories per tablespoon, it’s calorie-dense like any oil, but what sets it apart is an unusually high concentration of a fatty acid called palmitoleic acid that benefits both your cardiovascular system and your skin.
What Makes the Fat Profile Unusual
A comparative study of 15 macadamia cultivars found that monounsaturated fats make up 81% to 84% of the oil’s total fatty acids. Saturated fats account for 14% to 17%, and polyunsaturated fats are very low at just 1.5% to 2.8%. That monounsaturated percentage is higher than olive oil, avocado oil, and most other plant-based cooking oils.
The dominant fat is oleic acid, the same heart-healthy fat found in olive oil, making up 62% to 66% of total fatty acids. But macadamia oil’s standout feature is palmitoleic acid, an omega-7 fatty acid that accounts for 13% to 18% of the oil. Very few dietary sources provide palmitoleic acid in meaningful amounts, and this is where macadamia oil genuinely distinguishes itself from other cooking oils.
Heart and Cholesterol Effects
Diets rich in macadamia nuts have been shown to decrease total cholesterol and LDL (“bad”) cholesterol, modulating risk factors for coronary artery disease. This isn’t surprising given the oil’s similarity to olive oil in oleic acid content. Replacing saturated fats in your diet with monounsaturated fats from sources like macadamia oil consistently improves lipid profiles in clinical research.
The high monounsaturated and low polyunsaturated fat ratio also means macadamia oil is less prone to oxidation in your body. Polyunsaturated fats, while essential in small amounts, are more vulnerable to oxidative damage. Macadamia oil’s very low polyunsaturated content (under 3%) makes it one of the most oxidatively stable plant oils you can consume.
Anti-Inflammatory Properties
Animal research has shown that macadamia oil supplementation reduces inflammation in fat tissue and immune cells. In a study on obese mice fed a high-fat diet, adding macadamia oil increased levels of an anti-inflammatory signaling molecule by roughly fourfold compared to the control group. The oil also reduced the enlargement of fat cells, a process called adipocyte hypertrophy that drives chronic low-grade inflammation in people carrying excess weight.
These findings are from animal models, so the effects in humans may differ in magnitude. But the anti-inflammatory direction is consistent with what researchers see from other high-oleic acid oils, suggesting macadamia oil fits into an overall anti-inflammatory eating pattern.
Skin and Aging Benefits
Palmitoleic acid, the omega-7 fat concentrated in macadamia oil, has specific benefits for skin health. In lab studies, palmitoleic acid increased the production of collagen and elastin in human skin cells while reducing the activity of enzymes that break down collagen (a key driver of wrinkles and skin aging). When tested against UV damage, palmitoleic acid decreased the expression of multiple photoaging markers in skin cells.
In a mouse model of UV-induced skin aging, four weeks of palmitoleic acid supplementation decreased skin thickness and water loss through the skin while increasing moisture in the outermost skin layer. This is why macadamia nut oil appears in skincare products and why some people use it directly on their skin. Its composition closely mimics the fatty acids naturally found in human sebum, which helps it absorb without feeling greasy.
Cooking Performance
Macadamia nut oil has a smoke point of approximately 390°F (199°C), making it suitable for sautéing, stir-frying, roasting, and most stovetop cooking. It won’t work for very high-heat deep frying, but it handles everyday cooking temperatures well.
The oil’s high monounsaturated fat content and low polyunsaturated fat content give it strong oxidative stability, meaning it resists breaking down into harmful compounds when heated. This is a practical advantage over oils like flaxseed, walnut, or even some poorly refined vegetable oils that degrade more quickly at cooking temperatures. The flavor is mild and slightly buttery, so it works in both savory dishes and baking without overpowering other ingredients.
How It Compares to Olive Oil
The most common comparison is with extra virgin olive oil, and the two share a lot of common ground. Both are dominated by oleic acid and linked to cardiovascular benefits. Here’s where they differ:
- Monounsaturated fat: Macadamia oil is higher (81–84% vs. roughly 73% for olive oil).
- Palmitoleic acid: Macadamia oil contains 13–18%, while olive oil has only trace amounts.
- Polyphenols: Extra virgin olive oil is significantly richer in plant antioxidants called polyphenols, which have their own well-documented health benefits.
- Polyunsaturated fat: Olive oil provides more omega-3 and omega-6 fatty acids, which are essential nutrients your body can’t make on its own.
- Cost: Macadamia oil is typically two to three times more expensive than good olive oil.
Neither oil is strictly “better.” Olive oil brings more antioxidant polyphenols and essential fatty acids. Macadamia oil brings more palmitoleic acid and slightly better heat stability. Using both in your kitchen gives you the widest range of benefits.
Calorie Density and Portion Size
One tablespoon of macadamia nut oil contains 130 calories and 14 grams of fat. That’s identical to virtually every other cooking oil. The fat is high quality, but it’s still calorie-dense. If you’re watching your weight, measure rather than pour freely. A tablespoon or two per meal is a reasonable amount for cooking or dressing a salad.
Tree Nut Allergies
If you have a tree nut allergy, macadamia oil requires caution. Refined nut oils have the allergenic proteins removed during processing and are generally considered safe for people with nut allergies. However, it can be difficult to verify how thoroughly a particular oil has been refined, and cold-pressed or virgin macadamia oils retain more protein. If you have a severe tree nut allergy, avoiding all nut-derived oils is the safer approach.