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Logo of jcinvestThe Journal of Clinical InvestigationCurrent IssueArchiveSubscriptionAbout the Journal
J Clin Invest. Jan 1990; 85(1): 144–151.
PMCID: PMC296399

A low-fat diet decreases high density lipoprotein (HDL) cholesterol levels by decreasing HDL apolipoprotein transport rates.

Abstract

Diets that reduce atherosclerosis risk lower levels of HDL cholesterol (HDL-C), but the significance of this is unclear. To better understand the mechanism of this phenomenon we studied the turnover of HDL apolipoproteins A-I and A-II in 13 subjects on two contrasting metabolic diets. Upon changing from high to low intake of saturated fat and cholesterol the mean HDL-C decreased 29% from 56 +/- 13 (SD) to 40 +/- 10 mg/dl, while apo A-I levels fell 23% from 139 +/- 22 to 107 +/- 22 mg/dl (both P less than 0.001). Mean apo A-II levels did not change. The fractional catabolic rate (FCR) of apo A-I increased 11% from 0.228 +/- 0.048 to 0.254 +/- 0.063 pools/d, while its absolute transport rate (TR) decreased 14% from 12.0 +/- 2.7 to 10.3 +/- 3.4 mg/kg per d (both P = 0.005). The decrease in HDL-C and apo A-I levels correlated with the decrease in apo A-I TR (r = 0.79 and 0.83, respectively; P less than 0.001), but not with the increase in apo A-I FCR (r = -0.04 and -0.02, respectively). In contrast, within each diet the HDL-C and apo A-I levels were inversely correlated with apo A-I FCR both on the high-fat (r = -0.85 and -0.77, P less than 0.001 and = 0.002, respectively) and low-fat diets (r = -0.67 and -0.48, P = 0.012 and 0.098, respectively) but not with apo A-I TR. In summary, diet-induced changes in HDL-C levels correlate with and may result from changes in apo A-I TR. In contrast, differences in HDL-C levels between people on a given diet correlate with and may result from differences in apo A-I FCR. Therefore, the mechanism of dietary effects on HDL levels differs substantially from the mechanism explaining the differences in levels between individuals on a fixed diet. In assessing coronary heart disease risk, it may be inappropriate to conclude that diet-induced decreases in HDL are equivalent to low HDL within a given diet.

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Selected References

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