Comparative effects of polyunsaturated- to saturated fatty acid ratio versus polyunsaturated- and monounsaturated fatty acids to saturated fatty acid ratio on lipid metabolism in rats.

Abstract:

:This study examined the effects of various polyunsaturated fatty acid (PUFA, P)/saturated fatty acid (SFA, S) ratio versus PUFA + monounsaturated fatty acid (MUFA, M)/SFA ratio on lipid metabolism. The P/S ratio of dietary fat was fixed at a certain level (0.5, 1, 2, or 4, respectively) for each of four pairs of rat groups respectively, and then the P + M/S ratio was changed for the four pairs of rat groups. When the P/S ratio was fixed at 0.5, 1, 2, or 4, the plasma total cholesterol, LDL-cholesterol (C), and HDL-C levels did not show any significant difference in each pair of groups with different P + M/S ratios. However, when the P/S ratio was fixed at 1.0, the higher P + M/S ratio of 5.7 (M/S=4.7, P/M=0.2) resulted in significantly higher plasma total triacylglycerol (TAG), VLDL-TAG, VLDL-C, and VLDL-phospholipid (PL) than the lower P + M/S ratio of 1.4 (M/S=0.4, P/M=2.4). Whereas when SFA was fixed at a similar level, it therefore had approximately the same P + M/S ratio(5.3, 5.6, 5.7), and by increasing the P/S ratio from 1, 2 to 4 (70.4, 52.7 and 23.2% of the total fatty acids as MUFA respectively), the plasma VLDL-C, VLDL-TAG, and VLDL-PL concentrations decreased progressively. When PUFA or MUFA was kept on a similar level (14.9 or 53% respectively), the higher P + M/S ratio (5.7 or 5.3, respectively) resulted in significantly greater accumulation of liver cholesterol than the lower P + M/S ratio of 2.2. When the P/S ratio was fixed at 1 or 4, the diet of higher P + M/S ratio in a pair of the groups also resulted in greater accumulation of liver cholesterol. The results of the study suggests that if the P + M/S ratio was below 3, the change in the P/S ratios (0.5, 1 or 2) did not affect the levels of plasma total and lipoprotein cholesterol and TAG. Increases in the plasma VLDL-C and VLDL-TAG were related to increased MUFA content in the diet. And high MUFA content resulted in greater accumulation of liver cholesterol. It seems that the prerequisites for keeping low plasma and liver cholesterol are (a) low M/S ratio and (b) high P/M ratio and (c) P + M/S ratio not to exceed 3.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Chang NW,Huang PC

doi

10.1016/s0021-9150(98)00236-6

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

185-91

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(98)00236-6

journal_volume

142

pub_type

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