Total lipoprotein subclasses

Supplementation of walnut in the diet of 13 postmenopausal women and five men also showed increased serum concentrations of linoleic acid (18 2co6) and a-linolenic acid (18 3co3), and decreased plasma total and LDL cholesterol concentrations [20]. Measurements of lipoprotein subclasses and particle size suggested that walnut supplementation lowered cholesterol preferentially in small LDL. However, the researchers of the same study also observed a decrease in HDL cholesterol concentrations, and they attributed it primarily to decreases of the large HDL particles [20]. 

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