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Effects of walnut consumption on blood lipids and other cardiovascular risk factors: A meta-analysis and systematic review – Source: American Journal of Clinical Nutrition, Jul 2009

  [ 38 votes ]   [ 1 Comment ]
By Deirdre K Banel, Frank B Hu • • June 19, 2009

Background: Consumption of nuts has been associated with a decreased risk of cardiovascular disease events and death.

Walnuts in particular have a unique profile: They are rich in polyunsaturated fatty acids, which may improve blood lipids and other cardiovascular disease risk factors.

Objectives: We aimed to conduct a literature review and a meta-analysis to combine the results from several trials and to estimate the effect of walnuts on blood lipids.

Design: Literature databases were searched for published trials that compared a specifically walnut-enhanced diet with a control diet. We conducted a random-effects meta-analysis of weighted mean differences (WMDs) of lipid outcomes.

Results: Thirteen studies representing 365 participants were included in the analysis. Diets lasted 4 to 24 weeks with walnuts providing 10% to 24% of total calories.

When compared with control diets, diets supplemented with walnuts resulted in a significantly greater decrease in total cholesterol and in LDL-cholesterol concentrations :

• Total cholesterol: WMD = –10.3 mg/dL, P < 0.001;

• LDL [“bad”] cholesterol: WMD = –9.2 mg/dL, P < 0.001.

HDL [“good”] cholesterol and triglycerides were not significantly affected by walnut diets more than with control diets :

• HDL cholesterol: WMD = –0.2, P = 0.8;

• Triglycerides: WMD = –3.9, P = 0.3.

Other results reported in the trials indicated that walnuts:

• Provided significant benefits for certain antioxidant capacity and inflammatory markers

• And had no adverse effects on body weight [body mass index (kg/m2): WMD = –0.4, P = 0.5; weight (kg): WMD = –0.05, P = 0.97].

Conclusions: Overall, high-walnut-enriched diets significantly decreased total and LDL cholesterol for the duration of the short-term trials. Larger and longer-term trials are needed to address the effects of walnut consumption on cardiovascular risk and body weight.

Source: American Journal of Clinical Nutrition, Jul 2009;90(1);56-63. PMID: 19458020, by Banel DK, Hu FB. Departments of Nutrition and Epidemiology, Harvard School of Public Health, Harvard University, Cambridge, Massachusetts, USA. [E-mail:]

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Posted by: crez
Jul 1, 2009
black or english walnuts?
Reply Reply
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