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Micronutrients and the bone mineral content of the mother, fetus and newborn / A Prentice in Journal of Nutrition, Vol.133 n°5 Suppl 2 (Mai 2003)
Titre : Micronutrients and the bone mineral content of the mother, fetus and newborn Type de document : texte imprimé Auteurs : A Prentice, Auteur Année de publication : 2003 Article en page(s) : pp.1693S-1699S Langues : Anglais (eng) Catégories : Foetus
Nourrisson et enfant de 0 à 2 ans
Mots-clés : Os Index. décimale : PH.1.1 Lactation Résumé : The fluxes of the primary bone-forming minerals, calcium, phosphorus, magnesium and zinc, across the placenta and through breast milk place considerable demands on maternal mineral economy. Increases in food consumption, elevated gastrointestinal absorption, decreased mineral excretion and mobilization of tissue stores are several possible biological strategies for meeting these extra mineral requirements. This paper presents a review of the evidence on the extent to which these strategies apply in the human situation, the mechanisms by which they occur, the limitations imposed by maternal diet and vitamin D status and the possible consequences for the growth of the infant and bone health of the mother. On the strength of current evidence it appears that pregnancy and lactation are associated with physiological adaptive changes in mineral metabolism that are independent of maternal mineral supply within the range of normal dietary intakes. These processes provide the minerals necessary for fetal growth and breast milk production without requiring an increase in maternal dietary intake or compromising maternal bone health in the long term. This may not apply to pregnant women whose mineral intakes or sunlight exposure are marginal. As a vehicle for promoting optimal growth and bone mineral content of infants, supplementation of lactating women with minerals or vitamin D is unlikely to prove effective. The situation in pregnancy is less certain. Until more studies have been conducted, a precautionary case can be made for targeted supplementation of pregnant women who have very low intakes of calcium or who are at risk of vitamin D deficiency. En ligne : http://jn.nutrition.org/content/133/5/1693S.long Permalink :
in Journal of Nutrition > Vol.133 n°5 Suppl 2 (Mai 2003) . - pp.1693S-1699S[article]The roles of zinc in lactation / Elizabeth McGuire in Breastfeeding Review, Vol. 24, n°3 (Novembre 2016)
Titre : The roles of zinc in lactation Type de document : texte imprimé Auteurs : Elizabeth McGuire, Auteur ; Renee Kam, Auteur Année de publication : 2016 Article en page(s) : pp. 41-48 Langues : Anglais (eng) Catégories : Alimentation
Note de contenu : Zinc is a mineral which has many important functions in the body. Its role in human health has been appreciated only relatively recently and there is still research to be done to reveral the ways in which it functions. Zinc is important at the cellular level, in every organ and body system. It is sais to play three major biological roles; catalytic, structural and regulatory.
Zinc is a component of over 300 metalloenzymes and stabilises the structure of numerous proteins, notably a family of proteins that are involved in binding ti DNA and regulating gene transcription. As a component of proteins, zinc is essential to cell growth, differentiation, development, division, DNA synthesis and RNA transcription, among other things. It is involved in processes such as protein digestion and synthesis, carbohydrate metabolism, collagen production, bone metabolism, oxygen transport and protection against free radical damage (Garrow, James & Ralph, 2000; National Health [MoH], 2014). As regards lactation, zinc is essential to breast development and is secreted into breastmilk.
This paper outlineshow a healthy diet meets our zinc needs and provides examples of the ways in which zinc is involved in lactation. Since it is integral to so many physiological processes, zinc nutrition is an underlying element in multiple aspects of healthy functioning, notably in foetal growth, immune system function, blood clotting, bone mineralisation and cognitive function (Chasapis, Loutsidou, Spiliopoulou & Stefanidou, 2012). Zinc nutrition is throught to be involved in risks for cardiovascular diseases, diabetes, oxidative stress, cancer, ageing and depression (Chsapis et al., 2012).
Zinc is indeed an essential micronutrient.[Introduction de l'auteur]
in Breastfeeding Review > Vol. 24, n°3 (Novembre 2016) . - pp. 41-48[article]