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Influence of Dietary Fat Level and Dietary Tocopherols on Plasma Tocopherols of Human Subjects

Lipid Nutrition Laboratory, Nutrition Institute, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705

The responses of plasma tocopherols to dietary tocopherols were studied for 21 human subjects. Ten male and eleven female human subjects, ages 40 to 60, were fed 25%-fat-calorie diets for 40 days followed by a second 40-day feeding period of 35%-fat calorie diets. The average tocopherol content of the 25%-fat-calorie 2,000 kcal diets as analyzed was 7.6 mg and of the 35%-fat-calorie 2,800 kcal diets was 12.9 mg. Plasma tocopherol concentrations were determined at the beginning of the study and again at the termination of each of the two 40-day dietary periods. Average plasma tocopherols for females for these three samplings in order were 8.9, 7.6, and 9.4 µg tocopherol/g of plasma and 1.0, 0.6, and 0.7 µg tocopherol/g of plasma. Average plasma tocopherol values for the same samplings for males were 6.3, 5.3, and 7.0 µg tocopherol/g of plasma and 0.8, 0.6, and 0.8 µg tocopherol/g of plasma. For females, correlations were significant between plasma tocopherol and total cholesterol for all three samplings and between plasma tocopherol and triglyceride at the end of the second dietary period. For males, correlations were significant between plasma tocopherol and triglyceride at the end of both dietary periods, but not at the pre-study sampling.

KEY WORDS: • Vitamin E • tocopherol • dietary fat • plasma • lipids • human

Manuscript received 16 July 1976.

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