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Eur J Clin Nutr. 2002 Jul;56(7):629-37.

Serum lipid profiles in Japanese women and men during consumption of walnuts.

Author information

1
Laboratory of Nutrition Chemistry, Division of Bioresource and Bioenvironmental Sciences, Graduate School, Kyushu University, Fukuoka, Japan.

Abstract

OBJECTIVE:

To determine the serum cholesterol, apolipoproteins and LDL oxidizability in young Japanese women and men during walnut consumption and to evaluate its active principle.

DESIGN:

Experimental study with a randomized design.

SUBJECTS:

Twenty healthy women and 20 healthy men.

INTERVENTIONS:

Subjects were randomly assigned to consume each of two mixed natural diets for 4 weeks in a cross-over design. Reference and walnut diets were designed and the walnut diet had 12.5% of the energy derived from walnuts (44-58 g/day).

RESULTS:

The total cholesterol and serum apolipoprotein B concentrations, and the ratio of LDL cholesterol to HDL cholesterol was significantly lowered in women and men when fed on the walnut diet, than when on the reference diet (P<or=0.05). The LDL cholesterol concentration was significantly lowered in women on the walnut diet (0.22 mmol/l, P=0.0008), whereas this decrease was not significant in men (0.18 mmol/l, P=0.078). The most prominent change in the fatty acid composition of the cholesteryl esters from serum after the walnut diet was an elevation of alpha-linolenic acid in women (76%, P<0.001) and men (107%, P<0.001). This elevation was negatively correlated to the change in LDL cholesterol in women (r=0.496, P=0.019) and men (r=0.326, P=0.138). The LDL oxidizability in women was not influenced by the diets (P=0.19).

CONCLUSIONS:

alpha-Linolenic acid in the walnut diet appears to be responsible for the lowering of LDL cholesterol in women.

SPONSORSHIP:

Kyushu University (Fukuoka, Japan) and the California Walnut Commission (California, USA).

PMID:
12080402
DOI:
10.1038/sj.ejcn.1601400
[Indexed for MEDLINE]
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