Could replacing one everyday snack improve your cholesterol profile and help protect your arteries?
Almonds and walnuts may get most of the attention, but creamy, buttery macadamia nuts are also gaining recognition for their potential heart-health benefits.
Often associated with rich cookies and desserts, macadamias are packed with unsaturated fats that may support cardiovascular health when they replace foods containing higher levels of saturated fat.
So what could a small daily serving actually mean for your arteries and long-term heart health?
Two leading dietitians explain the research to Our News Outlet and offer practical advice for adding macadamias to a balanced eating plan.
Macadamias receive less attention than almonds or cashews, but these underappreciated tree nuts are also rich in nutrients linked to heart health
Why monounsaturated fats matter
Macadamias stand apart not only for their smooth texture but also for their distinctive nutritional profile. They contain substantial amounts of monounsaturated fat, particularly oleic acid, as well as dietary fiber and other plant-based nutrients.
‘Macadamia nuts are a rich source of monounsaturated fats, with 56.5 percent of their energy coming from oleic acid and about 14 percent of calories coming from palmitoleic acid,’ Frances Burke, a registered and clinical dietitian with the Preventive Cardiology and Lipidology Program at the University of Pennsylvania Health System, told Our News Outlet.
Together with naturally occurring plant sterols, these fats may help reduce low-density lipoprotein (LDL) cholesterol, commonly known as “bad” cholesterol.
Macadamias also provide L-arginine, an amino acid involved in nitric oxide production. Nitric oxide helps support normal artery function and vascular tone, potentially easing the workload on blood vessels and the heart.
Helping manage LDL cholesterol and blood lipids
Excess LDL cholesterol in the bloodstream is a major contributor to plaque buildup in the arteries and cardiovascular disease.
However, research indicates that replacing saturated fats with healthier monounsaturated fats can lower LDL cholesterol while preserving the body’s overall fat balance, according to the American Heart Association.
Clinical evidence supports that dietary approach.
A study in the Journal of Nutrition reported that adults with moderately elevated cholesterol saw significant declines in total cholesterol and LDL cholesterol after following a diet enriched with macadamia nuts.
The important point, experts say, is not simply to add nuts to an existing diet. Their greatest value comes from using them in place of less healthy, saturated-fat-rich foods.
‘When macadamia nuts and their unsaturated fat replace foods higher in saturated fat, the overall fat quality of the diet improves, which can lower LDL cholesterol,’ Tara Schmidt, lead dietitian with the Mayo Clinic Diet, told Our News Outlet.
Supporting flexible arteries and insulin sensitivity
Macadamias are easy to use in a curry, yogurt bowl or salad
YOU MAY ALSO READ: Ground Stop Blamed on Aging Equipment in a Remote Area
Macadamias may offer benefits beyond cholesterol management by supporting the health of blood vessels.
Their combination of unsaturated fats and plant nutrients may help arteries remain flexible, allowing blood to circulate more efficiently and potentially helping to reduce blood pressure.
L-arginine in nuts also contributes to nitric oxide production, a process that helps relax blood vessels and promote healthy blood flow, Burke said.
Maintaining a healthy inner lining in the arteries is essential for blood-pressure regulation and vascular protection.
A February 2025 review in the American Journal of Clinical Nutrition found that including tree nuts, including macadamias, in a Mediterranean-style diet may improve blood-vessel responsiveness and insulin function.
Better insulin sensitivity helps regulate blood sugar and reduces pressure on the pancreas’s insulin-producing cells, which could contribute to a lower risk of type 2 diabetes.
Portion control: Choosing and eating macadamias
Macadamias are energy-dense, providing roughly 200 calories per ounce, so serving size matters. Keeping portions moderate can help people gain their potential heart benefits without unintentionally consuming excess calories or gaining weight.
Experts recommend viewing macadamias as a replacement for less nutritious foods, not as an additional item added to an already full diet.
‘About 1oz — a small handful — is a practical serving, and portion awareness matters when hunger hits because these should be calories replacing foods high in saturated fat, not simply added to the diet,’ Schmidt said.
At the store, choose raw or dry-roasted macadamias that are unsalted or lightly salted. It is best to avoid varieties cooked in heavy oils or covered with added sugar.
For an easy daily serving, sprinkle chopped macadamias over oatmeal or yogurt, mix them into a salad for added crunch, or enjoy a small handful with fresh fruit as a snack.
The bottom line
Experts told Our News Outlet that macadamias are calorie-dense, so they are best used instead of foods high in saturated fat rather than added to an already calorie-rich diet
Macadamias are more than an occasional indulgence. Used thoughtfully, they can provide a simple, evidence-supported way to improve the quality of a heart-conscious diet.
Replacing saturated-fat-rich foods with a modest serving may help reduce LDL cholesterol, support healthy blood vessels and contribute to better metabolic health.
The key is to keep portions reasonable.
‘Mindful portioning is crucial when adding energy-dense nuts to your diet, and the focus should always be on using them to replace foods high in saturated fats rather than simply adding more calories to your meals,’ Burke said.
For many people, swapping in macadamias can be a flavorful step toward better long-term heart health.
