Oat β-Glucan Reduces Serum LDL Cholesterol in Humans with Serum LDL Cholesterol <160mg/dL

Author(s): Thomas M.S. Wolever, Daniel Raederstorff, Ruedi Duss.

Journal Name: Immunology, Endocrine & Metabolic Agents in Medicinal Chemistry (Discontinued)

Volume 16 , Issue 2 , 2016

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Abstract:

Background: It is well established that consuming ≥3g high-molecular-weight (MW) oat β-glucan (OBG) reduces low-density-lipoprotein-cholesterol (LDL-C). However, the effect of OBG on LDL-C in people with an LDL-C <160 mg/dL, is not clear.

Objective: To determine the effect of OBG on LDL-C in people with LDL-C <160 mg/dL.

Method: We reanalyzed the results of a previously published randomized, controlled, double- blind clinical trial on the effect on LDL-C of consuming breakfast cereal containing 3g high-MW (3H), 4g medium-MW (4M), 3g medium-MW (3M), 4g low-MW (4L) OBG or a wheat-bran control (W) for 4-weeks. We included only the 247 (67%) of the 367 subjects with LDL-C <160 mg/dL at screening. Changes in LDL-C from 0- to 4-weeks on each treatment were analyzed by one-way ANOVA and individual means compared by Tukey’s test (2-tailed t<0.05) to adjust for multiple comparisons. OBG viscosity was measured after simulated digestion in an in-vitro system.

Results: On W, 3H, 4M, 3M and 4L, respectively, LDL-C changed by (mean±SEM) +2.1±1.9, -8.1±2.1, -8.9±3.0, -4.8±2.9 and -1.0±2.6 mg/dL; the changes on 3H (MW=2,2000,000 g/mol) and 4M (MW=850,000 g/mol) differed significantly from that on W; the changes on 3M (MW=530,000 g/mol) and 4L (MW=210,000 g/mol) were not significant. Mean changes in LDL-C were negatively related to log (viscosity) (p=0.015).

Conclusion: Consuming 3g oat β-glucan is effective in reducing LDL-C in people with healthy LDL-C levels, but a MW of at least 850,000 g/mol is required for an optimal effect.

Keywords: β-Glucan, dietary fiber, LDL-cholesterol, molecular weight, oats, Randomized clinical trial, serum cholesterol, viscosity.

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Article Details

VOLUME: 16
ISSUE: 2
Year: 2016
Page: [122 - 128]
Pages: 7
DOI: 10.2174/1871522216999160531145548

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