Eating macadamias does not lead to weight gain and may benefit certain cardiometabolic risk factors, like unhealthy blood lipid levels, according to a new study (1).
The randomised cross-over trial, involving 35 people, explored the effect of daily macadamia intake on body weight and composition, and other factors like plasma lipids (including total cholesterol and LDL-cholesterol) and glycaemic measures (such as insulin resistance).
About the study:
Study participants were between 40-75 years-old, and had abdominal obesity plus one extra cardiometabolic risk factor.
They ate their usual diet, but added macadamias (making up ~15% of their daily kilojoules, or between 35-59g/day) for eight weeks (‘intervention’ phase), and had another eight weeks without macadamia nuts (the ‘control’ phase).
The research findings:
The study, by a team from Loma Linda University in California, found that macadamia intake did not lead to changes in waist circumference, body weight or percentage of body fat – despite an average increased energy intake of around 400kJ/day.
And compared to the control diet, consumption of macadamias led to reductions in total cholesterol, LDL (bad) cholesterol and apolipoprotein B (the main protein in LDL-cholesterol), and decreases in average weight and body mass index, although these were not statistically significant.
Macadamia intake did not impact glycaemic parameters, including measures of insulin resistance.
The macadamia (‘intervention’) diet increased heart-healthy mono-unsaturated fat intake by 11.5%, compared with the control diet – but did not affect saturated fat intake.
- Jones J., et al. Macadamia nut effects on cardiometabolic risk factors: A randomised trial. Journal of Nutritional Science, 2023. 12, E55. doi:10.1017/jns.2023.39
- Neale EP., Tran G., Brown RC. Barriers and facilitators to nut consumption: A narrative review. Int. J. Environ. Res. Public Health, 2020. 17:9127.
- Nikodijevic CJ., et al. Nut consumption in a representative survey of Australians: A secondary analysis of the 2011–2012 National Nutrition and Physical Activity Survey. Public Health Nutr, 2020. 23(18): 1–11.