Macadamia Nuts: Nutrition Facts, Health Benefits, and the World’s Most Monounsaturated Nut

Macadamia nuts occupy a unique position among tree nuts. At 718 calories per 100g and 75.8g of fat, they are the most calorie-dense and fat-rich nut commonly eaten — numbers that initially sound alarming until you examine the fat composition: 58.9g of that fat is monounsaturated, giving macadamias the highest absolute monounsaturated fat content of any nut, higher even than olive oil gram for gram. Combined with 100% of the daily thiamine requirement, 33% of magnesium, 27% of phosphorus, and just 5.2g of net carbohydrates per 100g — the lowest net carb count of any common nut — macadamia nuts have a genuinely distinctive nutritional identity that makes them the premier choice for specific dietary approaches, and a flavorsome, healthy fat source for everyone else.

Macadamia Nuts Nutrition Facts (per 100g)

Macadamia Nuts Nutrition Facts (per 28g serving — approximately 10–12 whole nuts)

A standard serving of macadamia nuts is approximately 28g:

A 28g serving provides 28% of daily thiamine and 16.5g of heart-healthy monounsaturated fat at just 1.5g of net carbohydrates.

Vitamins in Macadamia Nuts (per 100g)

Standout: Macadamia nuts hit exactly 100% of the daily thiamine requirement per 100g — making them one of the richest thiamine sources of any nut and among the most concentrated whole-food sources available. Thiamine is the rate-limiting coenzyme for converting carbohydrates to cellular energy via pyruvate dehydrogenase in the Krebs cycle, and its presence at this concentration in a primarily fat-based food is nutritionally distinctive. Macadamia nuts also provide a well-distributed B vitamin spread across riboflavin (15% DV), niacin (16% DV), pantothenic acid (16% DV), and B6 (17% DV), creating a comprehensive B complex alongside their dominant fat profile.

Minerals in Macadamia Nuts (per 100g)

Standout: Macadamia nuts’ magnesium (33% DV per 100g) and phosphorus (27% DV) figures are genuinely strong for a nut where the primary nutritional story is fat quality — these minerals matter for ATP production and bone health respectively, and they bring meaningful depth to a food that might otherwise be dismissed as “just fat and calories.” The iron figure (21% DV, non-haem) is also notable, though at typical 28g serving sizes the practical contribution is around 6% DV — still meaningful for a snack food.

The Monounsaturated Fat Story: The Fattiest Nut, With the Best Fat Profile

This is the central nutritional fact about macadamia nuts, and it deserves clear, direct explanation.

The Numbers in Context

At 58.9g of monounsaturated fat per 100g, macadamia nuts have:

• A higher absolute monounsaturated fat content than any other common nut
• A higher MUFA proportion (78% of total fat) than any other common nut
• More monounsaturated fat per 100g than extra-virgin olive oil itself (approximately 73g per 100g in olive oil — but eaten in far smaller volumes than nuts)

What Monounsaturated Fat Does

Monounsaturated fat, primarily oleic acid in macadamias, is the same heart-healthy fatty acid that makes olive oil and the Mediterranean dietary pattern so consistently associated with reduced cardiovascular disease in research. The mechanisms are well-documented: oleic acid reduces LDL cholesterol while maintaining or modestly raising HDL, reduces inflammatory cytokine production, improves endothelial function, and has antioxidant properties that protect LDL from oxidative modification — the step that makes LDL genuinely damaging to arterial walls.

The Palmitoleic Acid Distinction

Macadamia nuts contain a notably high concentration of palmitoleic acid — an omega-7 monounsaturated fatty acid found in very few common foods. Palmitoleic acid has attracted research interest for potential roles in improving insulin sensitivity and reducing inflammatory markers, and its exceptional concentration in macadamias gives them a distinctive fatty acid fingerprint that other high-MUFA foods don’t share to the same degree.

The Cardiovascular Research

Multiple randomized controlled trials have specifically tested macadamia nut consumption on cardiovascular risk markers, consistently finding significant reductions in total and LDL cholesterol, with no adverse effects on body weight despite macadamias’ high calorie density — consistent with the broader body of nut research showing that nut consumption is not associated with weight gain in controlled settings.

The Thiamine Story: 100% Daily Value in a Fat-Rich Nut

The 100% DV thiamine figure is somewhat unexpected in a food that is predominantly fat, and is worth explaining specifically.

Thiamine (Vitamin B1) is water-soluble and most commonly associated with carbohydrate-rich plant foods — it is the rate-limiting coenzyme for pyruvate dehydrogenase, the enzyme that converts pyruvate (the end product of glucose breakdown) to acetyl-CoA for entry into the Krebs cycle. Foods very high in carbohydrate are typically the richest thiamine sources, which is why lentils, flaxseeds, and whole grains feature prominently in this comparison across the site.

Macadamia nuts are an exception — their thiamine concentration is among the highest of any nut despite their very low carbohydrate content, reflecting the particular thiamine accumulation characteristics of the macadamia species rather than a carbohydrate-related co-occurrence. For people on ketogenic or very low-carbohydrate diets where traditional grain-based thiamine sources are restricted, macadamia nuts represent a genuinely valuable and practical thiamine source that fits naturally within the dietary framework.

Macadamia Nuts and the Ketogenic Diet

Macadamias are the most ketogenic-compatible commonly available nut, and their profile warrants specific attention for anyone following a low-carbohydrate or ketogenic dietary approach.

The Net Carbohydrate Calculation

Of macadamias’ 13.8g of total carbohydrates per 100g, 8.6g is fiber — which is not digested and absorbed as glucose. The remaining 5.2g of net carbohydrates per 100g — just 1.5g in a typical 28g serving — is among the lowest net carb counts of any tree nut, making macadamias exceptionally compatible with strict carbohydrate restriction.

Macadamias sit at the very low-carb end of the nut spectrum, with only pecans and Brazil nuts matching or slightly beating them — though both of those lack macadamias’ exceptional MUFA content and thiamine concentration.

The Fat Fuel Perspective

For ketogenic dieters specifically, macadamias’ high monounsaturated fat content is more valuable than a nut dominated by polyunsaturated or saturated fat, since MUFA intake is broadly associated with the cardiometabolic benefits that make a well-formulated ketogenic diet defensible from a health perspective beyond simply reducing carbohydrates.

Health Benefits of Macadamia Nuts

Heart Health Through Exceptional Monounsaturated Fat

As detailed above, the clinical research on macadamia nut consumption consistently shows significant improvements in blood lipid profiles — reduced total and LDL cholesterol, with no adverse effect on body weight. The combination of oleic acid (the same fatty acid in olive oil) and palmitoleic acid (the distinctive omega-7 found at high concentration in macadamias) gives this fat profile an evidence base that is both well-established and genuinely specific to this food.

Strong Magnesium and Phosphorus for Bone and Energy

At 33% DV magnesium and 27% DV phosphorus per 100g, macadamia nuts provide meaningful contributions to two minerals important for both bone mineralization and cellular energy production through ATP synthesis. Magnesium is involved in over 300 enzymatic reactions and is one of the most commonly deficient minerals in modern diets; its 33% DV per 100g from a pleasant, convenient snack food is a practical advantage.

Thiamine for Energy Metabolism

As detailed above, the 100% DV thiamine content supports the rate-limiting step in carbohydrate-to-energy conversion — a useful contribution from a predominantly fat-based food, and particularly relevant for low-carbohydrate eaters where traditional thiamine sources are reduced.

Meaningful Fiber for Satiety and Gut Health

At 8.6g of fiber per 100g, macadamia nuts deliver substantial fiber content despite their dominant fat profile, contributing to bowel regularity, gut microbiome feeding through prebiotic fermentation, and the satiety that slows the rate at which their calorie density translates to excess intake.

Iron and Zinc for Broad Nutritional Support

At 21% DV iron and 12% DV zinc per 100g, macadamias make meaningful mineral contributions — modest per 28g serving but consistent across the day for anyone eating them regularly as part of their diet.

Macadamia Nuts for Athletes and Active People

Calorie-Dense Energy for Muscle Building Phases

At 718 kcal per 100g — the highest of any nut covered on this site — macadamia nuts are one of the most calorie-efficient ways to add quality calories during a deliberate surplus without needing to eat unrealistic food volumes. The calories come from a genuinely heart-healthy fat source rather than from sugar or processed ingredients, making them a better quality calorie source than most ultra-dense convenience foods used for bulking.

Magnesium for Training Demands

At 33% DV magnesium per 100g (9% DV per 28g serving), macadamia nuts contribute to the magnesium intake that athletes deplete through sweat, supporting the ATP production and muscle contraction function that training demands.

The Ketogenic Athlete Application

For athletes following ketogenic or low-carbohydrate dietary protocols — which have found specific applications in certain endurance and body composition contexts — macadamia nuts are the single most compatible nut snack available, providing fat-based calories, meaningful thiamine and magnesium, strong satiety, and near-negligible carbohydrate impact.

The Australian Origin Story

Macadamia nuts are one of the few major commercial food crops native to Australia — specifically to the subtropical rainforests of Queensland and northern New South Wales. They were a significant food source for Aboriginal Australians for thousands of years before European contact, known as kindal kindal or boombera in various languages.

Commercial cultivation began in Hawaii in the late 19th century, after macadamia trees were introduced there, and for most of the 20th century Hawaii was the world’s dominant macadamia producer — which is why many people associate them with Hawaiian cuisine. Australia has since reclaimed its position as the world’s largest macadamia producer, accounting for approximately 30–40% of global production, with the nuts now grown commercially across several continents including Africa, South America, and Asia.

The macadamia shell is notably the hardest nut shell in the world — requiring approximately 300 pounds per square inch of force to crack — which is why macadamias are almost never sold in-shell for home cracking, unlike walnuts or almonds, and why all commercial processing requires specialized cracking machinery.

Practical Ways to Include Macadamia Nuts in Your Diet

As a plain snack — the simplest application; a 28g handful of unsalted macadamia nuts provides a satisfying, sustained-energy snack with exceptional fat quality.

In baking — chopped macadamia nuts in cookies, banana bread, or bliss balls add texture, flavor, and a nutritionally impressive fat profile to baked goods.

Macadamia nut butter — blended macadamia nuts produce one of the creamiest, most buttery nut butters available, with the same fat profile as whole macadamias.

In trail mix — macadamia nuts combined with dark chocolate, dried fruit, and other nuts create a calorie-dense, satisfying portable snack with multiple nutrient profiles contributing simultaneously.

As a crust for fish or chicken — crushed macadamia nuts used as a coating for baked fish or chicken add texture, healthy fat, and thiamine alongside the protein of the main ingredient.

In salads — whole or roughly chopped macadamia nuts add crunch and richness to salads, particularly those with a tropical or Asian-inspired flavor profile.

Potential Considerations

Calorie density is the primary consideration — at 718 kcal per 100g and 201 kcal per 28g serving, macadamia nuts require portion awareness for anyone managing total calorie intake; they are easy to overeat relative to their caloric contribution.

Lower protein than most other nuts — at 7.9g of protein per 100g, macadamias are the lowest-protein common tree nut (compared to almonds at 21.2g, cashews at 18.2g, peanuts at 25.8g); people specifically choosing nuts for protein contribution will get a better return from other varieties.

Tree nut allergy — macadamia nut allergy, while less common than some other tree nut allergies, is documented and can cause severe reactions; people with tree nut allergies should avoid them.

Toxic to dogs — macadamia nuts are specifically toxic to dogs, causing weakness, hyperthermia, and neurological symptoms even in small amounts; keep out of reach of pets.

Cost — macadamia nuts are typically the most expensive commonly available nut, which may make them impractical as a daily dietary staple compared to almonds or cashews.