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Influence of feeding different vegetables on plasma levels of carotenoids, folate and vitamin C. Effect of disruption of the vegetable matrix.
Br J Nutr. 1999 Sep; 82(3):203-12.BJ

Abstract

Carotenoids, folate and vitamin C may contribute to the observed beneficial effects of increased vegetable intake. Currently, knowledge on the bioavailability of these compounds from vegetables is limited. We compared the efficacy of different vegetables, at the same level of intake (i.e. 300 g/d), in increasing plasma levels of carotenoids, folate and vitamin C and we investigated if disruption of the vegetable matrix would enhance the bioavailability of these micronutrients. In an incomplete block design, sixty-nine volunteers consumed a control meal without vegetables and three out of four vegetable meals (i.e. broccoli, green peas, whole leaf spinach, chopped spinach; containing between 1.7 and 24.6 mg beta-carotene, 3.8 and 26 mg lutein, 0.22 and 0.60 mg folate and 26 and 93 mg vitamin C) or a meal supplemented with synthetic beta-carotene (33.3 mg). Meals were consumed for 4 d and fasting blood samples were taken at the end of each period. Consumption of the spinach-supplemented meal did not affect plasma levels of beta-carotene, although the beta-carotene content was 10-fold those of broccoli and green peas, which induced significant increases in plasma beta-carotene levels (28 (95% CI 6.4, 55)% and 26 (95% CI 2.6, 54)% respectively). The beta-carotene-supplemented meal increased plasma concentrations of beta-carotene effectively (517 (95% CI 409, 648)%). All vegetable meals increased the plasma concentrations of lutein and vitamin C significantly. Broccoli and green peas were, when expressed per mg carotenoid consumed, also more effective sources of lutein than spinach. A significant increase in plasma folate concentration was found only after consumption of the spinach-supplemented meal, which provided the highest level of folate. Disruption of the spinach matrix increased the plasma responses to both lutein (14 (95% CI 3.7, 25)%) and folate (10 (95% CI 2.2, 18)%), whereas it did not affect the response to beta-carotene. We conclude that the bioavailabilities of beta-carotene and lutein vary substantially among different vegetables and that the bioavailabilities of lutein and folate from spinach can be improved by disruption of the vegetable matrix.

Authors+Show Affiliations

Unilever Research Vlaardingen, The Netherlands. Karin-van-het.hof@unilever.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

10655967

Citation

van het Hof, K H., et al. "Influence of Feeding Different Vegetables On Plasma Levels of Carotenoids, Folate and Vitamin C. Effect of Disruption of the Vegetable Matrix." The British Journal of Nutrition, vol. 82, no. 3, 1999, pp. 203-12.
van het Hof KH, Tijburg LB, Pietrzik K, et al. Influence of feeding different vegetables on plasma levels of carotenoids, folate and vitamin C. Effect of disruption of the vegetable matrix. Br J Nutr. 1999;82(3):203-12.
van het Hof, K. H., Tijburg, L. B., Pietrzik, K., & Weststrate, J. A. (1999). Influence of feeding different vegetables on plasma levels of carotenoids, folate and vitamin C. Effect of disruption of the vegetable matrix. The British Journal of Nutrition, 82(3), 203-12.
van het Hof KH, et al. Influence of Feeding Different Vegetables On Plasma Levels of Carotenoids, Folate and Vitamin C. Effect of Disruption of the Vegetable Matrix. Br J Nutr. 1999;82(3):203-12. PubMed PMID: 10655967.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of feeding different vegetables on plasma levels of carotenoids, folate and vitamin C. Effect of disruption of the vegetable matrix. AU - van het Hof,K H, AU - Tijburg,L B, AU - Pietrzik,K, AU - Weststrate,J A, PY - 2000/2/3/pubmed PY - 2000/2/19/medline PY - 2000/2/3/entrez SP - 203 EP - 12 JF - The British journal of nutrition JO - Br J Nutr VL - 82 IS - 3 N2 - Carotenoids, folate and vitamin C may contribute to the observed beneficial effects of increased vegetable intake. Currently, knowledge on the bioavailability of these compounds from vegetables is limited. We compared the efficacy of different vegetables, at the same level of intake (i.e. 300 g/d), in increasing plasma levels of carotenoids, folate and vitamin C and we investigated if disruption of the vegetable matrix would enhance the bioavailability of these micronutrients. In an incomplete block design, sixty-nine volunteers consumed a control meal without vegetables and three out of four vegetable meals (i.e. broccoli, green peas, whole leaf spinach, chopped spinach; containing between 1.7 and 24.6 mg beta-carotene, 3.8 and 26 mg lutein, 0.22 and 0.60 mg folate and 26 and 93 mg vitamin C) or a meal supplemented with synthetic beta-carotene (33.3 mg). Meals were consumed for 4 d and fasting blood samples were taken at the end of each period. Consumption of the spinach-supplemented meal did not affect plasma levels of beta-carotene, although the beta-carotene content was 10-fold those of broccoli and green peas, which induced significant increases in plasma beta-carotene levels (28 (95% CI 6.4, 55)% and 26 (95% CI 2.6, 54)% respectively). The beta-carotene-supplemented meal increased plasma concentrations of beta-carotene effectively (517 (95% CI 409, 648)%). All vegetable meals increased the plasma concentrations of lutein and vitamin C significantly. Broccoli and green peas were, when expressed per mg carotenoid consumed, also more effective sources of lutein than spinach. A significant increase in plasma folate concentration was found only after consumption of the spinach-supplemented meal, which provided the highest level of folate. Disruption of the spinach matrix increased the plasma responses to both lutein (14 (95% CI 3.7, 25)%) and folate (10 (95% CI 2.2, 18)%), whereas it did not affect the response to beta-carotene. We conclude that the bioavailabilities of beta-carotene and lutein vary substantially among different vegetables and that the bioavailabilities of lutein and folate from spinach can be improved by disruption of the vegetable matrix. SN - 0007-1145 UR - https://www.unboundmedicine.com/medline/citation/10655967/Influence_of_feeding_different_vegetables_on_plasma_levels_of_carotenoids_folate_and_vitamin_C__Effect_of_disruption_of_the_vegetable_matrix_ L2 - https://www.cambridge.org/core/product/identifier/S0007114599001385/type/journal_article DB - PRIME DP - Unbound Medicine ER -