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Walnut-enriched diet reduces fasting non-HDL-cholesterol and apolipoprotein B in healthy Caucasian subjects: a randomized controlled cross-over clinical trial.
Metabolism. 2014 Mar; 63(3):382-91.M

Abstract

BACKGROUND

Walnut consumption is associated with reduced risk of coronary heart disease (CHD).

OBJECTIVE

We assessed the effect of walnuts on lipid and glucose metabolism, adipokines, inflammation and endothelial function in healthy Caucasian men and postmenopausal women ≥50years old.

DESIGN

Forty subjects (mean±SEM: age 60±1years, BMI 24.9±0.6kg/m(2); 30 females) were included in a controlled, cross-over study and randomized to receive first a walnut-enriched (43g/d) and then a Western-type (control) diet or vice-versa, with each lasting 8weeks and separated by a 2-week wash-out. At the beginning and end of each diet phase, measurements of fasting values, a mixed meal test and an assessment of postprandial endothelial function (determination of microcirculation by peripheral artery tonometry) were conducted. Area under the curve (AUC), incremental AUC (iAUC) and treatment×time interaction (shape of the curve) were evaluated for postprandial triglycerides, VLDL-triglycerides, chylomicron-triglycerides, glucose and insulin.

RESULTS

Compared with the control diet, the walnut diet significantly reduced non-HDL-cholesterol (walnut vs. control: -10±3 vs. -3±2mg/dL; p=0.025) and apolipoprotein-B (-5.0±1.3 vs. -0.2±1.1mg/dL; p=0.009) after adjusting for age, gender, BMI and diet sequence. Total cholesterol showed a trend toward reduction (p=0.073). Fasting VLDL-cholesterol, LDL-cholesterol, HDL-cholesterol, triglycerides and glucose, insulin, HOMA-IR, and HbA1c did not change significantly. Similarly, fasting adipokines, C-reactive protein, biomarkers of endothelial dysfunction, postprandial lipid and glucose metabolism and endothelial function were unaffected.

CONCLUSION

Daily consumption of 43g of walnuts for 8weeks significantly reduced non-HDL-cholesterol and apolipoprotein-B, which may explain in part the epidemiological observation that regular walnut consumption decreases CHD risk.

Authors+Show Affiliations

Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Metabolic and Nutritional Medicine at Dr. von Hauner Children's Hospital, University of Munich Medical Center, Munich, Germany.Division of Metabolic and Nutritional Medicine at Dr. von Hauner Children's Hospital, University of Munich Medical Center, Munich, Germany.Helmholtz Zentrum Muenchen, Institute for Health Economics and Healthcare Management, Neuherberg, Germany.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany.Division of Endocrinology, Diabetes, and Metabolism at Beth Israel Deaconess Medical Center, Boston, MA, USA.Division of Endocrinology and Metabolism at Medical Department 2, University of Munich Medical Center, Munich, Germany. Electronic address: klaus.parhofer@med.uni-muenchen.de.

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24360749

Citation

Wu, Liya, et al. "Walnut-enriched Diet Reduces Fasting non-HDL-cholesterol and Apolipoprotein B in Healthy Caucasian Subjects: a Randomized Controlled Cross-over Clinical Trial." Metabolism: Clinical and Experimental, vol. 63, no. 3, 2014, pp. 382-91.
Wu L, Piotrowski K, Rau T, et al. Walnut-enriched diet reduces fasting non-HDL-cholesterol and apolipoprotein B in healthy Caucasian subjects: a randomized controlled cross-over clinical trial. Metabolism. 2014;63(3):382-91.
Wu, L., Piotrowski, K., Rau, T., Waldmann, E., Broedl, U. C., Demmelmair, H., Koletzko, B., Stark, R. G., Nagel, J. M., Mantzoros, C. S., & Parhofer, K. G. (2014). Walnut-enriched diet reduces fasting non-HDL-cholesterol and apolipoprotein B in healthy Caucasian subjects: a randomized controlled cross-over clinical trial. Metabolism: Clinical and Experimental, 63(3), 382-91. https://doi.org/10.1016/j.metabol.2013.11.005
Wu L, et al. Walnut-enriched Diet Reduces Fasting non-HDL-cholesterol and Apolipoprotein B in Healthy Caucasian Subjects: a Randomized Controlled Cross-over Clinical Trial. Metabolism. 2014;63(3):382-91. PubMed PMID: 24360749.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Walnut-enriched diet reduces fasting non-HDL-cholesterol and apolipoprotein B in healthy Caucasian subjects: a randomized controlled cross-over clinical trial. AU - Wu,Liya, AU - Piotrowski,Katja, AU - Rau,Tiina, AU - Waldmann,Elisa, AU - Broedl,Uli C, AU - Demmelmair,Hans, AU - Koletzko,Berthold, AU - Stark,Renee G, AU - Nagel,Jutta M, AU - Mantzoros,Christos S, AU - Parhofer,Klaus G, Y1 - 2013/11/12/ PY - 2013/07/26/received PY - 2013/11/07/revised PY - 2013/11/08/accepted PY - 2013/12/24/entrez PY - 2013/12/24/pubmed PY - 2014/4/25/medline KW - Endothelial function KW - Glucose KW - Lipids KW - Nuts KW - Peripheral artery tonometry SP - 382 EP - 91 JF - Metabolism: clinical and experimental JO - Metabolism VL - 63 IS - 3 N2 - BACKGROUND: Walnut consumption is associated with reduced risk of coronary heart disease (CHD). OBJECTIVE: We assessed the effect of walnuts on lipid and glucose metabolism, adipokines, inflammation and endothelial function in healthy Caucasian men and postmenopausal women ≥50years old. DESIGN: Forty subjects (mean±SEM: age 60±1years, BMI 24.9±0.6kg/m(2); 30 females) were included in a controlled, cross-over study and randomized to receive first a walnut-enriched (43g/d) and then a Western-type (control) diet or vice-versa, with each lasting 8weeks and separated by a 2-week wash-out. At the beginning and end of each diet phase, measurements of fasting values, a mixed meal test and an assessment of postprandial endothelial function (determination of microcirculation by peripheral artery tonometry) were conducted. Area under the curve (AUC), incremental AUC (iAUC) and treatment×time interaction (shape of the curve) were evaluated for postprandial triglycerides, VLDL-triglycerides, chylomicron-triglycerides, glucose and insulin. RESULTS: Compared with the control diet, the walnut diet significantly reduced non-HDL-cholesterol (walnut vs. control: -10±3 vs. -3±2mg/dL; p=0.025) and apolipoprotein-B (-5.0±1.3 vs. -0.2±1.1mg/dL; p=0.009) after adjusting for age, gender, BMI and diet sequence. Total cholesterol showed a trend toward reduction (p=0.073). Fasting VLDL-cholesterol, LDL-cholesterol, HDL-cholesterol, triglycerides and glucose, insulin, HOMA-IR, and HbA1c did not change significantly. Similarly, fasting adipokines, C-reactive protein, biomarkers of endothelial dysfunction, postprandial lipid and glucose metabolism and endothelial function were unaffected. CONCLUSION: Daily consumption of 43g of walnuts for 8weeks significantly reduced non-HDL-cholesterol and apolipoprotein-B, which may explain in part the epidemiological observation that regular walnut consumption decreases CHD risk. SN - 1532-8600 UR - https://www.unboundmedicine.com/medline/citation/24360749/Walnut_enriched_diet_reduces_fasting_non_HDL_cholesterol_and_apolipoprotein_B_in_healthy_Caucasian_subjects:_a_randomized_controlled_cross_over_clinical_trial_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0026-0495(13)00387-9 DB - PRIME DP - Unbound Medicine ER -