vitamin A deficiency or for individuals being treated for diseases, such as retinitis pigmentosa, with vitamin A.
Effects of food matrices (e.g., carotenoids in milk and supplements) on the bioavailability of provitamin A carotenoids.
Age-related differences in the bioavailability of vitamin A.
Defined critical endpoints for population assessment for vitamin A and evaluation of their association with liver vitamin A stores.
Effect of dietary vitamin A and vitamin A status on turnover and utilization of vitamin A. Is there significant adaptation to low vitamin A intakes? Is vitamin A absorption increased in response to low vitamin A intake? Is catabolism upregulated as body stores increase?
Relationship of bioactive vitamin A indicators (e.g., retinoic acid) to dietary vitamin A intake.
Effects of pregnancy and lactation on maternal vitamin A turnover.
Effect of the interaction of vitamin A with other nutrients and food processing on the bioavailability of vitamin A.
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