The Bioavailability of Dietary Calcium

Guéguen, L.; Pointillart, Alain

doi:10.1080/07315724.2000.10718083

Cited by 448 publications

(331 citation statements)

References 128 publications

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“…One way to do this would be to build on this study's foundation using radiolabelled CaOx to definitively determine if it is being incorporated into the bone matrix and therefore being utilised, and also to use metabolic cages to accurately record intake and excrement of calcium (Guéguen & Pointillart, 2000). Metabolic cages facilitate the collection of all urine and faeces produced by an individual, the analysis of which would indicate the extent to which CaOx passes through the animal unutilised.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, individuals maintained on a diet in which the main source of calcium is CaOx will likely undergo increased bone resorption and reduced BMD if calcium is not being absorbed, when compared with individuals on a normal skeletal maintenance diet. Measuring bone parameters after prolonged exposure to treatment diet are a reliable way of estimating the long‐term effects of different calcium intakes in humans and rats (Guéguen & Pointillart, 2000). …”

Section: Introductionmentioning

confidence: 99%

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Regulation of bone mineral density in the grey squirrel, Sciurus carolinensis: Bioavailability of calcium oxalate, and implications for bark stripping

Nichols

Gregory

Goode

et al. 2017

Animal Physiology Nutrition

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SummaryThe damage caused when grey squirrels strip the outer bark off trees and ingest the underlying phloem can result in reduced timber quality or tree death. This is extremely costly to the UK forestry industry and can alter woodland composition, hampering conservation efforts. The calcium hypothesis proposes that grey squirrels ingest phloem to ameliorate a seasonal calcium deficiency. Calcium in the phloem predominantly takes the form of calcium oxalate (CaOx), however not all mammals can utilise CaOx as a source of calcium. Here, we present the results of a small‐scale study to determine the extent to which grey squirrels can utilise CaOx. One of three custom‐made diets containing calcium in varying forms and quantities (CaOx diet, Low‐calcium carbonate (CaCO 3) diet and Control diet) were fed to three treatment groups of six squirrels for 8 weeks. Bone densitometric properties were measured at the end of this time using peripheral quantitative computed tomography and micro‐computed tomography. Pyridinoline—a serum marker of bone resorption—was measured regularly throughout the study. Bone mineral density and cortical mineralisation were lower in squirrels fed the CaOx diet compared to the Control group but similar to that of those on the Low‐calcium diet, suggesting that calcium from calcium oxalate was not effectively utilised to maintain bone mineralisation. Whilst no differences were observed in serum pyridinoline levels between individuals on different diets, females had on average higher levels than males throughout the study. Future work should seek to determine if this apparent lack of ability to utilise CaOx is common to a large sample of grey squirrels and if so, whether it is consistent across all areas and seasons.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Regulation of bone mineral density in the grey squirrel, Sciurus carolinensis: Bioavailability of calcium oxalate, and implications for bark stripping

Nichols

Gregory

Goode

et al. 2017

Animal Physiology Nutrition

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“…Contudo, produtos lácteos não fazem parte da dieta habitual de adolescentes, adultos e idosos, em proporções suficientes para alcançar essas recomendações 13,18,20,30 . No caso de adolescentes e idosos, seriam necessárias pelo menos cinco porções diárias de leite e derivados para se atingir a AI 21 , o que acarretaria desequilíbrio na ingestão de macronutrientes, em razão da excessiva ingestão protéica que, por sua vez, poderia induzir a um aumento na excreção renal de cálcio 8 . Assim, a ingestão de alimentos de consumo habitual enriquecidos com o pó da casca de ovo pode contribuir para a ingestão adequada de cálcio sem comprometer a qualidade nutricional da dieta.…”

Section: Análise Comparativa Do Teor De Cálcio Das Formulações Fortifunclassified

“…Estudos descritivos conduzidos em vários países mostram um consumo de cálcio inadequado, muitas vezes abaixo de 50% da ingestão preconizada 7,13,20 . Outros fatores contribuem para o agravamento dessa situação de aporte inadequado de cálcio, como a presença de fitatos na dieta e o consumo elevado de proteínas, que podem reduzir a biodisponibilidade do mineral 8 .…”

Section: Introductionunclassified

Fortificação de alimentos com o pó da casca de ovo como fonte de cálcio

Naves¹,

Fernandes²,

Prado³

et al. 2007

Ciênc. Tecnol. Aliment.

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ResumoO pó da casca de ovo é usado como fonte de cálcio em multimisturas distribuídas no Brasil por organizações não-governamentais. O presente trabalho teve por objetivos fortificar, com o pó da casca de ovo, alimentos tradicionais, de baixo custo e de fácil preparo, e estimar a contribuição nutricional de porções desses alimentos para o aporte diário de cálcio. Foram elaboradas dez preparações de consumo habitual, que foram enriquecidas com o pó da casca de ovo (37,4% de cálcio) na proporção de 1 g do pó para 100 g de cereal ou farinha usada nos alimentos processados. Os alimentos fortificados apresentaram teores de cálcio entre 111,5 mg e 506,4 mg.100 g -1 , significativamente mais elevados que o conteúdo das formulações originais sem fortificação. Porções médias das formulações fortificadas perfazem de 14 a 32% das referências nutricionais de cálcio para indivíduos adultos. Conclui-se que alimentos de consumo habitual fortificados com o pó da casca de ovo podem contribuir de forma significativa para a ingestão adequada de cálcio e prevenção de deficiência do nutriente, especialmente de osteoporose, em indivíduos de diferentes grupos etários e extratos sociais. Palavras-chave: cálcio na dieta; casca de ovo; alimentos fortificados; osteoporose. AbstractEgg shell powder is used as a calcium source in a nutritional supplement known as "multimistura" that has been distributed in Brazil by non-governmental organizations. The objectives of this research were to fortify traditional, low cost and easy to prepare dishes with egg shell powder and to estimate the nutritional contribution of each portion to the calcium daily intake. Ten common dishes were prepared and fortified with egg shell powder (with 37.4% of calcium) at the rate of 1g to 100 g of cereal or flour used in the processing foods. The fortified foods showed a range of calcium concentrations between 111.5 mg and 506.4 mg.100 g -1 , which were significantly higher than the contents of the original formulations without fortification. Mean portions of fortified dishes provide about 14 to 32% of the nutritional calcium references for adults. It was concluded that traditional dishes fortified with egg shell powder could contribute significantly to the adequate calcium intake and to prevent calcium deficiency, mainly osteoporosis, in individuals of different age groups and social levels.

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“…Several studies have demonstrated the importance of considering both food groups and the overall diet in assessing their impact on bone health, which may partially explain the relationship between nutrient intake and bone mineral acquisition in children and adolescents (Heaney, 2004;Seiquer et al, 2008). Milk and dairy products contribute around 70% of total dietary calcium and thus, they are by far the main source of calcium in Western diets (Guéguen & Pointillart, 2000). Addition of these products to the adolescent's diet is the best strategy to meet calcium recommendations and to achieve optimal bone mineralization (Cadogan et al, 1997).…”

Section: Calciummentioning

confidence: 99%