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Soy Protein
Soy protein, LDL, HDL, and triglycerides:
A double-blind randomized parallel trial of 156 healthy men and women with LDL cholesterol levels between 3.62 mmol/L (140 mg/dL) and 5.17 mmol/L (200 mg/dL) were studied to identify the link between isoflavones together with soy protein or soy protein itself and cholesterol. Participants were randomly assigned to one of 5 daily diets: 25 g of casein [for isoflavone-free comparison] or 25 g of isolated soy protein containing 3, 27, 37, or 62 mg of isoflavones. Crouse et al found that subjects on a National Cholesterol Education Program Step I diet plus taking isolated soy protein with 62 mg isoflavones per 25 grams for 9 weeks lowered total cholesterol by about 4% and LDL cholesterol by about 6% compared to casein. A greater benefit was seen in subjects with higher LDL levels. The soy protein did not affect plasma concentrations of triglycerides or HDL cholesterol. (2)
