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Hydr'aness
Le sélénium est un oligo-élément antioxydant qui intervient dans le métabolisme des radicaux libres et d'autres substances produites par l'oxydation des lipides au niveau des membranes cellulaires. Dans notre organisme, il est principalement stocké dans les muscles et la glande thyroïde.
Du symbole Se, le sélénium a été isolé pour la 1ère fois par les chimistes Berzélius et Gahn en 1817. Son action antioxydante a été découverte dans les années 50.
Grâce à sa propriété antioxydante, le sélénium neutralise les radicaux libres présents dans l'organisme. En effet, il régule le processus oxydatif des cellules et joue un rôle dans la lutte contre le vieillissement cellulaire. Le sélénium contribue également au maintien de cheveux sains et au bon fonctionnement du système immunitaire. Cet oligo-élément ne peut être synthétisé naturellement par l'organisme. Il doit être apporté par le biais de compléments alimentaires et/ou l'alimentation. Ses apports étant multiples, le Sélénium est un antioxydant nécessaire à la bonne santé de notre organisme dans son ensemble.
Pour ne pas se retrouver en carence de sélénium, il est préférable de consommer des aliments riche de cet oligo-élément, tels que :
Les doses journalières de sélénium recommandées varient selon l'âge et le poids. Jusqu'à l'âge de 19 ans, l'apport recommandé est de 20 à 50 µg. À l'âge adulte, la dose journalière diffère entre les femmes et les hommes avec une variation entre 50 et 60 µg pour les femmes et 60 à 70 µg pour les hommes. À noter que les femmes allaitantes ont un besoin en sélénium plus conséquent afin de pouvoir également en transmettre au bébé. Ainsi, l'apport journalier qui leur est recommandé vacille autour de 75 µg. Enfin, les personnes âgées de plus de 75 ans présentent généralement un besoin en sélénium plus conséquent. L'apport qui leur est conseillé est d'environ 80 µg par jour.
La carence en sélénium est peu commune. Elle est généralement observée chez des personnes vivants dans des régions où le sol est appauvri en sélénium. Ce type de carence est également plus fréquent chez les personnes présentant une maladie intestinale chronique (ex : maladie de Crohn), les patients sous dialyse, les alcooliques et les fumeurs ainsi que les femmes allaitantes sur une longue période.
Une carence en sélénium peut provoquer de la fatigue, de l'anxiété, des douleurs articulaires, une immunodéficience, une baisse de la fertilité masculine.
Hydraness