Natural Food Sources of Vitamin A and Provitamin A

Booth, S. L.; Johns, Timothy; Kuhnlein, H. V.

doi:10.1177/156482659201400115

Cited by 39 publications

(22 citation statements)

References 67 publications

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“…Uncontrolled preparation method prior to β-carotene analysis may partly explain the difference between the values reported here and those already published [14,15]. Other factors that can potentially explain the variations are the speciesspecific (genetic diversity, and stage maturation) and ecological factors such as soil and seasonality, among others [16].…”

Section: Figure 2b: Relationship Between Proportions Of Income Spent contrasting

confidence: 58%

The contribution of African Leafy Vegetables (ALVs) to vitamin A intake and the influence of income in rural Kenya.

Oiye¹,

Shiundu²,

Oniang'o³

2009

African Journal of Food, Agriculture, Nutrition and Development

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Despite the increased recognition of African Leafy Vegetables (ALVs) as important source of vitamin A, there is still paucity of research highlighting on the vitamin A intake attributed to them. The level and the extent of contribution of ALVs could inform programming, monitoring and evaluation of vitamin A-related nutrition and development programs. The study aimed at investigating the level of contribution of ALVs to household vitamin A intake and the influence of household monthly income in a rural setting, through use of selected data from a cross-sectional vitamin A consumption survey in Butere-Mumias District, western Kenya. A multistage cluster sampling procedure was used to select 814 households considered for the survey. It was found that plant sources contributed about 43.1% of total household vitamin A intake. ALVs contributed 65.7% of vitamin A from plant sources and 32.7 % of household vitamin A intake. Predominant ALV was the cowpea leaves which accounted for about 45% of vitamin A contributed by ALVs, 34% of the contribution of plant sources and 14.7% of household vitamin A intake. Although the influence of monthly income on the level of vitamin A from ALVs was not conclusive, there were some indications that lower intake from ALVs was positively correlated with lower incomes and vice versa. Income was weakly and negatively associated with household vitamin A intake (r=-1.92, 3.7% of variance explained), and the opposite was true for the proportion of income spent on food verses household vitamin A intake (r=1.64, 2.7% of variance explained). It was apparent that ALVs formed an important dietary source of vitamin A in rural households in western Kenya with cowpea leaves as a predominant contributor. In areas of similar environmental conditions, ALVs production, marketing and consumption should be promoted. There was no evidence that increase in income among the rural folk may likely improve ALVs consumption and vitamin A intake. It is thus recommended that development programs and policies consider ALVs as significant source of vitamin A, and that increments in incomes per se may not significantly influence household vitamin A intake and from ALVs.

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Section: Figure 2b: Relationship Between Proportions Of Income Spent contrasting

confidence: 58%

The contribution of African Leafy Vegetables (ALVs) to vitamin A intake and the influence of income in rural Kenya.

Oiye¹,

Shiundu²,

Oniang'o³

2009

African Journal of Food, Agriculture, Nutrition and Development

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“…The clinicians should monitor the antioxidant status closely throughout pregnancy and provide nutritional guidance. Pregnant women whose vitamin A concentrations are low should be advised to consume animal products and deeply colored vegetables and fruits [37], whereas those with low vitamin E concentrations should be instructed on food sources rich in vitamin E, such as vegetable oils, nuts, and seeds [38]. Otherwise, antioxidant supplementation may be a rational treatment option to correct the nutritional deficiency.…”

Section: Discussionmentioning

confidence: 99%

Plasma concentrations of vitamin A and E and risk of dysglycemia in first-trimester pregnant Saudi women

Kutbi

Hammouda

2020

Diabetol Metab Syndr

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Background: Existing evidence suggest that low concentrations of vitamin A and E may have a contribution to the development of diabetes complications; however, data regarding the status of vitamin A and E among individuals with prediabetes are lacking. This study aimed to examine the association of plasma concentrations of vitamin A and E with the glycemic control status among first trimester pregnant Saudi women. Methods:In this cross-sectional study, 1102 first trimester pregnant Saudi women were recruited from antenatal clinics. Sociodemographic and anthropometric information were collected, and laboratory analyses of blood glycated hemoglobin (A1C) and plasma vitamins A and E were performed. Subjects were classified as normoglycemic, prediabetic, or undiagnosed diabetic. Multinomial regression models adjusted for age estimated the adjusted odds ratios (aORs) and [95% confidence intervals (CIs)].Results: Among the sample, 78.8% (n = 868) had normal glycemic control, while 19.1% (n = 211) had prediabetes and 2.1% (n = 23) had undiagnosed diabetes. Plasma concentrations of vitamin A and E of prediabetic participants were at a level midway between that of normoglycemic and diabetic participants (p < 0.01). Compared to subjects with normoglycemic status, those with higher concentrations of vitamin A and E had lower odds of being prediabetic (aOR = 0.27 [0.21-0.35] and aOR = 0.95 [0.94-0.96], respectively) or diabetic (aOR = 0.18 [0.13-0.24] and aOR = 0.93 [0.92-0.94], respectively). Conclusions:Our findings indicate a possible contribution of vitamins A and E to the progression of prediabetes to diabetes. Future longitudinal studies are needed to elucidate the association between the antioxidant status and dysglycemia. Clinicians should monitor the glycemic and the antioxidant status closely and provide dietary guidance where needed.

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“…No entanto, as mais ricas fontes de provitamina A são dois óleos, amplamente encontrados no nordeste brasileiro: dendê e buriti (9). As raízes brancas e tubérculos, assim como todos os grãos, apresentam conteúdo reduzido em provitamina A. Contudo, nem sempre a coloração é sinônimo de atividade biológica dos carotenóides, pois estes se encontram nas mesmas células que abrigam a clorofila e sua cor é mascarada por ela (10).…”

Section: Fontes De Vitamina Aunclassified

A deficiência de vitamina A no Brasil: um panorama

Souza¹,

Boas²

2002

Rev Panam Salud Publica

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Este trabalho propõe-se a descrever a trajetória da implantação das ações de controle da deficiência de vitamina A no Brasil. Métodos Trata-se de estudo baseado em dados secundários, obtidos nos registros, documentos técnicos e relatórios oficiais do Instituto Nacional de Alimentação e Nutrição, autarquia do Ministério da Saúde extinta em 1997, da Coordenação Geral da Política Nacional de Alimentação e Nutrição do Ministério da Saúde, e informa-ções obtidas com informantes-chaves, empregando a abordagem multidimensional alicerçada na tríade: estrutura-processo-resultado. Resultados O Brasil foi pioneiro na iniciativa de introduzir a distribuição de vitamina A nas campanhas nacionais de imunização, estratégia posteriormente preconizada pela Organização Mundial da Saúde e pelo Fundo das Nações Unidas para a Infância. Desde 1983, o Ministério da Saúde utiliza megadoses de vitamina A, como uma das ações para combater a deficiência deste micronutriente. O percentual de cobertura da população alvo (crianças de 6 a 59 meses) tem aumentado, alcançando 72% e 68%, nos anos de 2002 e 2003, respectivamente. Essas coberturas são semelhantes às registradas nos 40 países que adotam esta estratégia. Desde 2001 o programa foi ampliado para beneficiar puérperas, no pós-parto imediato. Conclusão Foram modestos os avanços obtidos até o ano de 1992, fato que pode ser explicado pela falta de regularidade na distribuição das cápsulas de vitamina A. A partir de 1994, o programa manteve certa constância, porém

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Natural Food Sources of Vitamin A and Provitamin A

Cited by 39 publications

References 67 publications

The contribution of African Leafy Vegetables (ALVs) to vitamin A intake and the influence of income in rural Kenya.

The contribution of African Leafy Vegetables (ALVs) to vitamin A intake and the influence of income in rural Kenya.

Plasma concentrations of vitamin A and E and risk of dysglycemia in first-trimester pregnant Saudi women

A deficiência de vitamina A no Brasil: um panorama

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