Related Experiment Videos
Sex differences in postabsorptive plasma vitamin A transport
E J Johnson1, S D Krasinski, R M Russell
1USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA 02111.
The American Journal of Clinical Nutrition
|November 1, 1992
Summary
This study found that women showed a lower plasma retinyl ester response after vitamin A supplementation compared to men. This suggests potential differences in how men and women process and clear vitamin A metabolites.
Area of Science:
- Nutritional Biochemistry
- Human Physiology
Background:
- Vitamin A is crucial for vision, immune function, and cell growth.
- Retinyl palmitate is a common form of vitamin A supplementation.
- Understanding sex-based differences in vitamin A metabolism is important for personalized nutrition.
Purpose of the Study:
- To investigate sex differences in postabsorptive plasma vitamin A response after administering retinyl palmitate.
- To compare the pharmacokinetic profiles of vitamin A metabolites in healthy males and females.
Main Methods:
- Healthy men and women received a physiologic (3000 RE) and a pharmacologic (105,000 RE) dose of retinyl palmitate on consecutive days.
- Blood samples were collected, and plasma retinol and retinyl esters were quantified using High-Performance Liquid Chromatography (HPLC).
- Tolerance curves were generated, measuring peak plasma retinyl ester concentration, peak rise, and area under the curve (AUC).
Main Results:
- Females exhibited an earlier peak plasma retinyl ester concentration, particularly with the low dose in younger subjects and high dose in older subjects.
- Both peak rise and AUC of plasma retinyl esters were lower in females than males, significantly so for the high dose.
- In older subjects receiving the high dose, males showed a significantly greater peak rise in plasma retinyl esters compared to females.
Conclusions:
- Women may have a more efficient clearance of chylomicron remnants, leading to a lower observed plasma retinyl ester response.
- Sex and age interact to influence vitamin A absorption and metabolism.
- Further research into the mechanisms of sex-based differences in vitamin A handling is warranted.