Summary: In 28 older adults (mean age 65 years, BMI 27.9 kg/m2) with overweight or obesity, 60 g/day of mixed nuts for 16 weeks, compared with a no-nut control period in a randomised single-blinded crossover trial, significantly lowered apolipoprotein B by 0.07 g/L (p=0.009) and reduced total VLDL particle number by 24 nmol/L (p<0.001). Total and non-HDL cholesterol, triacylglycerol, and LDL particle number were also reduced, while HDL particles were unchanged.
PICO Summary
| Element | Detail |
|---|---|
| Population | 28 older adults who completed the trial (mean age 65 years, BMI 27.9 kg/m2) with overweight or obesity; randomised single-blinded controlled crossover design; conducted in the Netherlands. |
| Intervention | Mixed nuts 60 g/day (15 g each of walnuts, pistachios, cashews, and hazelnuts) for a 16-week period (n=28; crossover, all participants). |
| Comparison | A 16-week control period with no nuts, separated from the nut period by an 8-week washout (n=28; crossover, all participants). |
| Outcome | Mixed nuts reduced apolipoprotein B by 0.07 g/L (p=0.009), total cholesterol by 0.27 mmol/L (p=0.047), non-HDL cholesterol by 0.28 mmol/L (p=0.022), and total triacylglycerol by 0.27 mmol/L (p=0.008). Total VLDL particle number fell by 24 nmol/L (p<0.001) across all VLDL subclasses; total LDL particle number was reduced (p=0.044), driven by IDL (p=0.002) and large LDL (p=0.015). HDL particle number and size were unaffected. The abstract reported point estimates and p-values; 95% confidence intervals were not provided, and no event-based ARR or NNT applies to these continuous lipid outcomes. |
Mixed Nuts and Lipoprotein Particles
RCT crossover · overweight older adults · 16 weeks
Daily 60 g mixed nuts modestly lowered apoB and VLDL and LDL particle numbers over 16 weeks, with HDL unchanged. Small sample and no confidence intervals limit certainty, and no cardiovascular events were measured.
Expert Commentary
This randomised single-blinded crossover trial supports a modest but consistent lipid benefit from adding 60 g/day of mixed nuts to the diet of older adults with overweight or obesity. Because the design was within-subject, each participant served as their own control, which strengthens the internal comparison despite the small sample. The favourable shift in apoB-containing particles, with lower VLDL and LDL particle numbers and unchanged HDL, is biologically coherent and points towards a less atherogenic profile that standard cholesterol panels may underestimate. The principal limitation is statistical fragility: only 28 participants completed the protocol, several p-values sit close to 0.05, and the abstract reports no confidence intervals, so the precision of these estimates cannot be judged from the summary alone. The trial measured intermediate lipoprotein markers over 16 weeks, not cardiovascular events, so a reduction in actual disease risk remains inferred rather than demonstrated. Can I use this with my patients? Cautiously yes, for a motivated older patient with overweight and borderline lipids who can tolerate the calorie load of a daily handful of nuts, framed as a reasonable dietary adjunct rather than a substitute for guideline lipid management. Larger and longer trials with hard endpoints are needed before stronger claims are warranted.
References
Nijssen KMR, Chavez-Alfaro MA, Joris PJ, Plat J, Mensink RP. Effects of Longer-Term Mixed Nut Consumption on Lipoprotein Particle Concentrations in Older Adults with Overweight or Obesity. Nutrients. 2024;17(1):8. doi:10.3390/nu17010008
