Do dry roasting, lightly salting nuts affect their cardioprotective properties and acceptability?
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Previous studies have reported improvements in cardiovascular disease (CVD) risk factors with the consumption of raw nuts. However, around one-third of nuts consumed are roasted and salted. Thus, it is important to determine whether roasting and salting nuts affect the health benefits observed with raw nuts. This study aimed to compare the effects of consuming two different forms of hazelnuts on cardiovascular risk factors and acceptance.
Using a randomised crossover design, 72 participants were asked to consume 30 g/day of either raw or dry roasted, lightly salted hazelnuts for 28 days each. CVD risk factors were measured at the beginning and end of each treatment period. “Desire to consume” and “overall liking” for both forms of hazelnuts were assessed daily using a 150-mm visual analogue scale.
Body composition, blood pressure, plasma total and low-density lipoprotein-cholesterol, apolipoprotein A1 and B100, glucose and α-tocopherol concentrations did not differ between forms of hazelnuts (all P ≥ 0.054). High-density lipoprotein (HDL)-cholesterol (P = 0.037) and triacylglycerol (P < 0.001) concentrations were significantly lower following the consumption of dry roasted, lightly salted hazelnuts when compared to the raw hazelnuts. Compared with baseline, consuming both forms of hazelnuts significantly improved HDL-cholesterol and apolipoprotein A1 concentrations, total-C/HDL-C ratio, and systolic blood pressure without significantly changing body composition. Acceptance ratings did not differ between forms of hazelnuts and remained high throughout the study.
Dry roasting and lightly salting nuts do not appear to negate the cardioprotective effects observed with raw nut consumption, and both forms of nuts are resistant to monotony. Public health messages could be extended to include dry roasted and lightly salted nuts as part of a heart healthy diet.
KeywordsHazelnuts Roasting Salting Cardiovascular disease Acceptance
We would like to thank the participants for their commitment and enthusiasm in participating in this study.
The authors’ responsibilities were as follows—S.L.T., T.R., A.R.G., A.W.C. and R.C.B. designed the study; T.R. conducted the research; S.L.T., A.W.C. and R.C.B. supervised the data collection; S.L.T. and A.R.G. analysed the data; S.L.T. and R.C.B. wrote the manuscript. All authors read and approved the final manuscript.
Compliance with ethical standards
Conflict of interest
None of the authors had any personal or financial conflict of interest.
- 2.New Zealand Ministry of Health (2015) Mortality and demographic data 2012. Ministry of Health, WellingtonGoogle Scholar
- 7.Tey SL, Brown R, Chisholm A (2012) Nuts and heart health. National Heart Foundation of New Zealand evidence-based position statement on the relationship of nuts to heart health. National Heart Foundation of New Zealand, AucklandGoogle Scholar
- 23.Alasalvar C, Shahidi F (2009) Tree nuts: composition, phytochemicals, and health effects: an overview. In: Alasalvar C, Shahidi F (eds) Tree nuts: composition, phytochemicals, and health effects. Taylor & Francis Group, Boca Raton, pp 1–10Google Scholar
- 28.Bjornson LK, Kayden H, Miller E, Moshell A (1976) The transport of alpha-tocopherol and beta-carotene in human blood. J Lipid Res 17:343–352Google Scholar
- 30.Marshall R (2003) Diet entry and storage, diet cruncher. Nutricomp, A batch processing diet analysis system for the PC. DunedinGoogle Scholar
- 31.Plant and Food Research (2006) FOODfiles. Datafiles of the New Zealand food composition database. Plant and Food Research, Palmerston NorthGoogle Scholar
- 32.Assmann G, Schriewer H, Schmitz G, Hagele EO (1983) Quantification of high-density-lipoprotein cholesterol by precipitation with phosphotungstic acid/MgCl2. Clin Chem 29:2026–2030Google Scholar
- 33.Friedewald WT, Levy RI, Fredrickson DS (1972) Estimation of the concentration of low-density lipoprotein cholesterol in plasma, without use of the preparative ultracentrifuge. Clin Chem 18:499–502Google Scholar
- 34.Neeley WE (1972) Simple automated determination of serum or plasma glucose by a hexokinase-glucose-6-phosphate dehydrogenase method. Clin Chem 18:509–515Google Scholar
- 35.Thurnham DI, Smith E, Flora PS (1988) Concurrent liquid-chromatographic assay of retinol, alpha-tocopherol, beta-carotene, alpha-carotene, lycopene, and beta-cryptoxanthin in plasma, with tocopherol acetate as internal standard. Clin Chem 34:377–381Google Scholar
- 36.Cummings J, Mann J (2012) Carbohydrates. In: Mann J, Truswell AS (eds) Essentials of human nutrition, 4th edn. Oxford University Press, New York, pp 21–48Google Scholar
- 37.Skeaff CM, Mann J (2012) Lipids. In: Mann J, Truswell AS (eds) Essentials of human nutrition, 4th edn. Oxford University Press, New York, pp 49–70Google Scholar
- 38.Grundy MM, Grassby T, Mandalari G, Waldron KW, Butterworth PJ, Berry SE et al (2015) Effect of mastication on lipid bioaccessibility of almonds in a randomized human study and its implications for digestion kinetics, metabolizable energy, and postprandial lipemia. Am J Clin Nutr 101:25–33CrossRefGoogle Scholar
- 42.Mohammadifard N, Salehi-Abargouei A, Salas-Salvadó J, Guasch-Ferré M, Humphries K, Sarrafzadegan N (2015) The effect of tree nut, peanut, and soy nut consumption on blood pressure: a systematic review and meta-analysis of randomized controlled clinical trials. Am J Clin Nutr 101:966–982CrossRefGoogle Scholar
- 43.National Health and Medical Research Council (2006) Nutrient reference values for Australia and New Zealand: executive summary. NHMRC, Canberra; Ministry of Health, WellingtonGoogle Scholar
- 51.Mattes RD, Dreher ML (2010) Nuts and healthy body weight maintenance mechanisms. Asia Pac J Clin Nutr 19:137–141Google Scholar
- 52.Finucane MM, Stevens GA, Cowan MJ, Danaei G, Lin JK, Paciorek CJ et al (2011) National, regional, and global trends in body-mass index since 1980: systematic analysis of health examination surveys and epidemiological studies with 960 country-years and 9.1 million participants. Lancet 377:557–567CrossRefGoogle Scholar
- 53.Wishnofsky M (1958) Caloric equivalents of gained or lost weight. Am J Clin Nutr 6:542–546Google Scholar
- 61.Gao X, Wilde PE, Lichtenstein AH, Bermudez OI, Tucker KL (2006) The maximal amount of dietary α-tocopherol intake in U.S. adults (NHANES 2001–2002). J Nutr 136:1021–1026Google Scholar