They performed a systematic review of dose-response clinical trials and controlled interventional trials. Databases such as MEDLINE/PubMed, Google Schoolar, Web of Science, Cochrane and ELSEVIER-Embase were used, and a total of 29 studies were included in this systematic review. 
 
Researchers found that almonds, walnuts, pecans and peanuts have mainly advantageous action toward total cholesterol and LDL “bad” cholesterol, whereas hazelnuts, pistachios and walnuts have mainly favorable action toward HDL “good” cholesterol. They also observed that all nuts included in this study resulted in an effective increase in good cholesterol levels.
 
This study was recently published in the journal Nutrition and Metabolic Insights.
 
Altamimi, M., Zidan, S., & Badrasawi, M. (2020). Effect of Tree Nuts Consumption on Serum Lipid Profile in Hyperlipidemic Individuals: A Systematic Review. Nutrition and Metabolic Insights. https://doi.org/10.1177/1178638820926521

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