The study was published recently in The American Journal of Clinical Nutrition.
 
Researchers conducted a search of PubMed and EMBASE databases of clinical trials comparing walnut-enriched diets with control diets. In total, 26 clinical trials with a total of 1,059 participants were included in the study.
 
Results showed that walnut-enriched diets may help reduce total blood cholesterol, LDL “bad” cholesterol and also triglyceride concentrations when compared with control diets. More pronounced reductions in blood lipids were observed when walnut interventions were compared with American and Western diets. The study concluded that the inclusion of walnuts into the diet may help improve blood lipid profile without adversely affecting body weight or blood pressure.
 
Guasch-Ferré, M., Li, J., Hu, F. B., Salas-Salvadó, J., & Tobias, D. K. (2018). Effects of walnut consumption on blood lipids and other cardiovascular risk factors: an updated meta-analysis and systematic review of controlled trials. The American Journal of Clinical Nutrition.

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