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Articles

Corn and Sesame Oils Increase Serum -Tocopherol Concentrations in Healthy Swedish Women¹

Marie Lemcke-Norojärvi^*2, Afaf Kamal-Eldin, Lars-Åke Appelqvist, Lena H Dimberg, Margareta Öhrvall^* and Bengt Vessby^*

^* Clinical Nutrition Research, Department of Public Health and Caring Science/Geriatrics, Uppsala University, Uppsala, Sweden and Department of Food Science, Swedish University of Agricultural Sciences, Uppsala, Sweden

²To whom correspondence should be addressed at Uppsala University, Department of Public Health and Caring Science/Geriatrics, Clinical Nutrition Research Unit, P.O. Box 609, SE-751 25 Uppsala, Sweden. E-mail: marie.norojarvi{at}geriatrik.uu.se

We studied the effects of dietary intervention with three vegetable oils (Linola, corn or sesame oil, all good sources of -tocopherol) on absolute and relative concentrations of - and -tocopherol in human serum. The oils contained only small amounts of linolenic acid but varying amounts of oleic and linoleic acids, and they had different concentrations of -tocopherol. Forty healthy female students (mean age 26 y) were randomly assigned to one of three groups and consumed a diet that contained one of the three oils for 4 wk. Refined oils were distributed as ingredients in specially prepared buns, in margarine or as dressing. Serum tocopherols, serum lipoproteins and plasma malondialdehyde concentrations were measured. The -tocopherol concentrations normalized to serum lipids increased significantly in the corn and sesame oil groups (P < 0.01), and the -/-tocopherol ratios decreased significantly from baseline concentrations in all groups (P < 0.05). The -tocopherol concentrations did not change during the diet period in any of the three groups. Serum cholesterol, serum apolipoprotein B and plasma malondialdehyde concentrations decreased significantly only in the Linola oil group (P < 0.05). These data show that a moderately modified natural diet that contains both - and -tocopherol increases the serum -tocopherol concentration in healthy women without affecting the serum -tocopherol concentration.

KEY WORDS: • vegetable oils • serum lipids • -tocopherol • -tocopherol • humans

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