The individual effects of dietary cholesterol and fat saturation on plasma lipoprotein concentrations were determined in an ethnically diverse population of normolipidemic young men (52 Caucasian, 32 non-Caucasian). The experimental diets contained -200 or 600 mg/d of cholesterol, 36-38% of calories as fat, and high or low proportions of saturated and polyunsaturated fat (polyunsaturated/saturated fat ratio -0.8 vs 0.3). At the lower cholesterol intake, the high saturated fat diet had only a modest effect on LDL cholesterol in Caucasians (+ 6 mg/di`) and none in non-Caucasians. 600 mg cholesterol with high saturated fat led to a substantial mean increase in LDL cholesterol, which was significantly greater in Caucasian than in non-Caucasian subjects (+ 31 mg/dl vs 16 mg/dl, P < 0.005). 600 mg cholesterol with increased polyunsaturated fat gave a mean LDL increase of 16 mg/dl, lower than found when the same high cholesterol intake was coupled with increased saturated fat. Variation in cholesterol rather than the proportions of saturated and polyunsaturated fat had the most influence on LDL-cholesterol levels. Among non-Caucasians it was the only significant factor. (J. Clin. Invest. 1995. 95:611-618.)

We have carried out a cross-sectional multivariate analysis of serum and lipoprotein lipid levels in white persons from an industrial population. Very low density lipoprotein triglyceride level was independent of ethanol consumption but increased with adiposity and cigarette smoking and decreased with coffee-tea drinking. Concomitant age variation in indices of adiposity accounted for only a small part of the sex-specific age trends in triglyceride level. Very low density lipoprotein cholesterol level was independent of all variables considered when controlled for very low density lipoprotein triglyceride. Low density lipoprotein cholesterol covaried with very low density lipoprotein triglyceride among normotriglyceridemic persons. Small increases in low density lipoprotein cholesterol level with adiposity and cigarette smoking appeared to reflect associated increases in very low density lipoprotein triglyceride. Increased low density lipoprotein cholesterol level with age, however, was largely independent of concomitant age variation in very low density lipoprotein triglyceride. High density lipoprotein cholesterol level increased with ethanol consumption and decreased with adiposity and cigarette smoking even after adjustment for its inverse relationship with very low density lipoprotein triglyceride.

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