© 1995 American Heart Association, Inc.
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Increases in Dietary Cholesterol Are Associated With Modest Increases in Both LDL and HDL Cholesterol in Healthy Young Women
From the Departments of Medicine (H.N.G., W.K., M.S., A.R.T., W.S.B.) and Pediatrics (S.H., R.R.), Columbia University College of Physicians and Surgeons, New York, NY.
Abstract We studied the effects of dietary cholesterol intake on lipid and lipoprotein levels in healthy young women (n=13) who were otherwise eating an American Heart Association (AHA) diet. The study used a randomized, three-way crossover design to determine the effects of 0, 1, or 3 eggs added per day (dietary cholesterol range, 108 to 667 mg/d). Each of the three diets was eaten for 8 weeks, with a washout period between diets. Three fasting blood samples were obtained during the last 3 weeks of each diet period to observe changes in fasting plasma lipid levels associated with the menstrual cycle. We also obtained blood just before and 4 and 8 hours after the subjects ingested a standard high-fat formula. During the menstrual cycle, total cholesterol and LDL cholesterol levels fell by 0.051 mmol/L (1.99 mg/dL) and 0.064 mmol/L (2.48 mg/dL) per week, respectively. HDL cholesterol concentrations increased by 0.060 mmol/L (2.3 mg/dL) per week during the first half of the cycle and then fell by 0.050 mmol/L (1.94 mg/dL) per week during the second half. Therefore, all statistical analyses were performed on values adjusted to midcycle. Total fasting cholesterol concentrations increased by 0.073 mmol/L (2.81 mg/dL) per 100 mg dietary cholesterol added to the diet per day (P=.001). LDL cholesterol increased by 0.054 mmol/L (2.08 mg/dL) per 100 mg/d dietary cholesterol (P=.003); this accounted for about 75% of the rise in total cholesterol. HDL cholesterol concentrations increased by 0.015 mmol/L (0.57 mg/dL) per 100 mg/d dietary cholesterol (P<.04). There was a wide range of responses among the women. Plasma apoB levels increased significantly, 0.93 mg/dL per 100 mg/d dietary cholesterol (P=.025), whereas apoA-I levels tended to rise (1.35 mg/dL per 100 mg/d, P=.056). Increases in dietary cholesterol did not produce any observable effects on fasting plasma cholesteryl ester transfer protein levels and had no effect on the response to a standard high-fat formula. Although menstrual-cycle changes in plasma total, LDL, and HDL cholesterol levels were observed, the effects of the diets were similar in the follicular and luteal phases of the menstrual cycle. Additionally, despite changes associated with the menstrual cycle, within-subject variation in plasma total cholesterol was actually smaller in this study than in our study of young men.
Key Words: plasma lipids • dietary fatty acids • menstrual cycle • lipoproteins
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