Could replacing one everyday snack improve your cholesterol profile and help protect your blood vessels?
Almonds and walnuts may get most of the attention, but creamy, buttery macadamia nuts are also proving to be a strong ally for heart health.
Often associated with rich cookies and desserts, macadamias are loaded with unsaturated fats that may benefit the heart when they take the place of foods high in saturated fat.
So what could a small daily serving mean for your arteries and long-term cardiovascular health?
Two dietitians explained the research to the Daily Mail and offered practical suggestions for adding macadamias to a balanced diet.
Macadamias may be less famous than almonds or cashews, but these overlooked tree nuts are packed with nutrients that support heart health
Why monounsaturated fats matter
Macadamias stand apart not only for their smooth texture but also for their distinctive nutritional profile. They are rich in monounsaturated fats, including oleic acid, as well as dietary fiber and other beneficial plant compounds.
‘Macadamia nuts are a rich source of monounsaturated fats, with 56.5 percent of their energy coming from oleic acid and roughly 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 the Daily Mail.
Alongside naturally occurring plant sterols, these unsaturated fats may help reduce low-density lipoprotein (LDL), commonly known as “bad” cholesterol.
Macadamias also provide L-arginine, an amino acid involved in the production of nitric oxide. That compound helps support normal artery function and vascular tone, potentially easing strain on the cardiovascular system.
Lowering LDL cholesterol
Excess LDL cholesterol can accumulate in artery walls, contributing to plaque buildup and raising the risk of heart disease.
Research cited by the American Heart Association suggests that replacing saturated fats with healthier monounsaturated fats can lower LDL cholesterol while maintaining a balanced overall lipid profile.
Clinical findings support that approach.
In a study published in the Journal of Nutrition, adults with moderately high cholesterol who followed a diet enriched with macadamias saw significant declines in both total cholesterol and LDL cholesterol.
The important point, experts say, is not simply to add nuts to an existing eating pattern, but to use them in place of less heart-friendly foods.
‘When macadamia nuts and their unsaturated fats replace foods higher in saturated fat, the overall quality of the diet improves, which can help lower LDL cholesterol,’ Tara Schmidt, lead dietitian with the Mayo Clinic Diet, told the Daily Mail.
Supporting flexible arteries and insulin function
Macadamias are easy to use in everyday meals, from curries and yogurt bowls to fresh salads
Macadamias may offer benefits beyond cholesterol control, including support for healthy blood vessels.
Their combination of unsaturated fats and plant nutrients may help arteries remain flexible, allowing blood to circulate more easily and potentially supporting healthy blood pressure.
L-arginine in nuts helps the body produce nitric oxide, a natural substance that relaxes blood vessels and promotes smoother blood flow, Burke explained.
Healthy function of the blood vessel lining is essential for regulating pressure and protecting the arteries.
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 the body’s ability to use insulin.
Better insulin sensitivity helps regulate blood sugar and may reduce pressure on the pancreas, potentially lowering the risk of developing type 2 diabetes.
How much to eat—and the best ways to serve them
Macadamias are nutrient-dense but also calorie-dense, providing about 200 calories per ounce. Keeping portions reasonable is therefore important for gaining their potential heart benefits without unintentionally promoting weight gain.
The most effective strategy is to use them as a replacement for less nutritious foods, rather than piling them on top of an already calorie-rich diet.
‘About 1oz—a small handful—is a practical serving, and portion awareness matters when hunger strikes. These calories should replace foods high in saturated fat, not simply be added to the diet,’ Schmidt said.
At the store, choose raw or dry-roasted macadamias that are unsalted or lightly salted. Avoid varieties cooked in heavy oils or covered with excess sugar.
For simple meal ideas, sprinkle chopped macadamias over oatmeal or yogurt, add them to salads for extra crunch or enjoy a small handful with fresh fruit as a snack.
The bottom line
Because macadamias are calorie-dense, experts told the Daily Mail they should replace foods high in saturated fat rather than be added to an already full diet
Macadamias are more than an occasional indulgence. Used thoughtfully, they can provide a science-backed way to improve the nutritional quality of your diet and support cardiovascular health.
Replacing saturated-fat-rich foods with a modest serving may help lower LDL cholesterol while supporting blood vessel function and overall metabolic health.
The key is to keep portions under control.
‘Mindful portioning is crucial when adding energy-dense nuts to your diet. The goal should always be to replace foods high in saturated fat, rather than simply adding more calories to meals,’ Burke said.
For many people, swapping in macadamias can be a flavorful step toward better long-term heart health.