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Barbara A. Underwood
Researcher at United States Department of Health and Human Services
Publications - 11
Citations - 748
Barbara A. Underwood is an academic researcher from United States Department of Health and Human Services. The author has contributed to research in topics: Retinol & Vitamin. The author has an hindex of 9, co-authored 11 publications receiving 744 citations.
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Journal ArticleDOI
Validation of a dietary questionnaire with plasma carotenoid and alpha-tocopherol levels.
Walter C. Willett,Meir J. Stampfer,Barbara A. Underwood,Frank E. Speizer,Bernard Rosner,C H Hennekens +5 more
TL;DR: Data support the utility of self-administered food frequency questionnaires for use in epidemiological studies and illustrate the importance of adjusting blood alpha-tocopherol levels for lipid concentrations when the former are used as surrogates for vitamin E intake.
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Vitamins A, E, and carotene: effects of supplementation on their plasma levels.
TL;DR: A randomized, double-blind trial among 59 generally well-nourished adults to determine the effects of vitamin A, vitamin E, and beta-carotene supplements on plasma retinol, alpha-tocopherol, and carotenoid levels.
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Liver Stores of Vitamin A in a Normal Population Dying Suddenly or Rapidly from Unnatural Causes in New York City
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Evaluation of the relative dose response test for vitamin A nutriture in cirrhotics
Sohrab Mobarhan,Robert M. Russell,Barbara A. Underwood,John C. Wallingford,Robert D. Mathieson,Haithan Al-Midani +5 more
TL;DR: The relative dose response (RDR) test appears to be useful as a predictor of vitamin A deficiency, even among patients with far advanced hepatic disease.
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Vitamin A Supplementation and Plasma Retinol Levels: A Randomized Trial Among Women
Walter C. Willett,Walter C. Willett,Walter C. Willett,Meir J. Stampfer,Meir J. Stampfer,Barbara A. Underwood,Laura Sampson,Charles H. Hennekens,John C. Wallingford,Lawton S. Cooper,Chung-Cheng Hsieh,Frank E. Speizer,Frank E. Speizer,Frank E. Speizer +13 more
TL;DR: Responses to vitamin A supplementation tend to be greater among women with lower previous total vitamin A intake, as assessed by questionnaire, and when the base-line retinol level and several other covariates were considered.